#help-0 | Mathematics | Page 841

ivory gulch Oct 8, 2021, 12:16 AM

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oh yeah i know h'

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do i know dr/dt

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?

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hmm ok

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idk how do find it

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im still thinking tho

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okay

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$V'=\frac{\pi }{3}\left(12rr'\right)$

ocean sealBOT Oct 8, 2021, 12:19 AM

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ski

ivory gulch Oct 8, 2021, 12:19 AM

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i'm here btw

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i hadn't scrolled down

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yes it does

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its 8"

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yeah haha

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i didn't see that lmao

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yeah sure

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i think i understand what you're saying, im just not sure how to do it

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👍

ocean sealBOT Oct 8, 2021, 12:28 AM

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marc

alpine sable Oct 8, 2021, 12:28 AM

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marc do u have stats background by any chance

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i have a simple question

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that i have an idea for

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ah ok

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keep getting ignored 😦

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ok np

ivory gulch Oct 8, 2021, 12:30 AM

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wait wait

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derivative of r^2 is r*r'?

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not 2r*r'?

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ok cool just making sure

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where is the extra r coming from

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oh damnit

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product rule

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i always forget product rule

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$V'=\frac{\pi }{3}\left(r^2h'+2hrr'\right)$

ocean sealBOT Oct 8, 2021, 12:33 AM

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ski

ivory gulch Oct 8, 2021, 12:33 AM

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?

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haha its ok bro

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i can do the calc

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just need help w concepts

ocean sealBOT Oct 8, 2021, 12:34 AM

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marc

ivory gulch Oct 8, 2021, 12:34 AM

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and knowing what the mf question is asking

ocean sealBOT Oct 8, 2021, 12:35 AM

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marc

ivory gulch Oct 8, 2021, 12:36 AM

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i only know one of those variables tho

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$6=\frac{\pi }{3}\left(r^2h'+2hrr'\right)$

ocean sealBOT Oct 8, 2021, 12:36 AM

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ski

ivory gulch Oct 8, 2021, 12:37 AM

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umm ok lemme think

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def just amount of coffee in the cone

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so calculate V at a height of 7

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i can put it into terms of v and r

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but i cant solve for either

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$V=\frac{7\pi }{3}r^2$

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oh boy

ocean sealBOT Oct 8, 2021, 12:40 AM

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ski

ivory gulch Oct 8, 2021, 12:40 AM

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i love trig

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catthumbsup

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this is the right triangle thing right

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ok lemme try really quick

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here's where i'm at

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no

candid nova Oct 8, 2021, 12:45 AM

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mb

ivory gulch Oct 8, 2021, 12:46 AM

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okay so u just cut off the bottom to get it down to 7

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but if you 'cut off' part of it

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the radius will change

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7tan(theta) = b (the value i picked for new radius)

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well idk what that angle is

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well my answer has a theta in it

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because idk that angle

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like i get b = 7/tan(theta)

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are cones isocolise triangles?

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dude no way im spelling that

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lmfao

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according to google yes ok

icy trail Oct 8, 2021, 12:53 AM

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to solve tanx = 6/7 just arctan both sides

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didnt see any context but maybe thats what you need

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oh lol

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i will leave then 👍

ivory gulch Oct 8, 2021, 12:54 AM

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how do you know radius is 4?

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you cut off part of the cone so radius isn't half of 8

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yes i understand

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but idk how i know theta

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ok

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one sec

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well ik you cut it in half

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but the radius isn't for when the height is 7

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but lemme find theta hold on

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wait

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idr how to do that lmfaoo

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i know tan(theta) is 2

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don't i have to use inverse trig functions or smth

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ah so its arctan(2)

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should i measure in rad or

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no that would be dumb

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63.435 degrees

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eys

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yes

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yes lemme try

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3.74

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radius

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?

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hm idk what i did wrong

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i got 61 degrees

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oh

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i didn't specify degrees to google

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so it did radians

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7/2?

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ish

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nice

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ok nice so now i have the radius at this point

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and the height

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so i plug those into $6=\frac{\pi }{3}\left(r^2h'+2hrr'\right)$

ocean sealBOT Oct 8, 2021, 1:05 AM

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ski

ivory gulch Oct 8, 2021, 1:05 AM

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dh/dt=6

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yes

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that's what i meant

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$6=\frac{\pi }{3}\left(12.25h'+49r'\right)$

ocean sealBOT Oct 8, 2021, 1:07 AM

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ski

ivory gulch Oct 8, 2021, 1:07 AM

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ok wait so how do i calculate change in radius

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can't i just rewrite the v' equation

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then im not sure what to do

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sorry to make you walk me thru it all

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arctan

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but that is to find a radius not to find dr/dt

ocean sealBOT Oct 8, 2021, 1:10 AM

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marc

ivory gulch Oct 8, 2021, 1:10 AM

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$\theta =tan^{-1}\left(\frac{h}{r}\right)$

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?

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wait yeah no

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here

ocean sealBOT Oct 8, 2021, 1:11 AM

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ski

ivory gulch Oct 8, 2021, 1:12 AM

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oh assuming i already know theta

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i mean its the same angle

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so yeah

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oh lol u already told me it basically

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$\frac{h}{tan\left(63.435\right)}=r$

ocean sealBOT Oct 8, 2021, 1:14 AM

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ski

ivory gulch Oct 8, 2021, 1:16 AM

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uhh i think i did it?

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seems wrong tho

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$tan\left(63.435\right)=r'$

ocean sealBOT Oct 8, 2021, 1:16 AM

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ski

ivory gulch Oct 8, 2021, 1:16 AM

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ok one sec

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tell me where i went wrong here

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yeah i remembered that

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but i forgot to do h'

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instead i just got rid of h

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bc times (1)

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low(d'high)-high(d'low)

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/low^2

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quotient rule

ocean sealBOT Oct 8, 2021, 1:18 AM

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marc

ivory gulch Oct 8, 2021, 1:18 AM

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omfg

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lmao

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its 1/tan(63...) *h

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lol

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okay haha

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good to know and practice regardless

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so r' = 1/tan(63.345)

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well let's just do a rn

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just to get it done

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so is that asking what is dh/dt at h=7

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hold on lemme volume of cylinder is just pi r^2h right

ocean sealBOT Oct 8, 2021, 1:21 AM

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marc

alpine sable Oct 8, 2021, 1:23 AM

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Can someone help me

ivory gulch Oct 8, 2021, 1:23 AM

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$6=2\pi \left(r^2h'+2hrr'\right)$

ocean sealBOT Oct 8, 2021, 1:23 AM

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ski

ivory gulch Oct 8, 2021, 1:23 AM

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no

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d/dr of r^2 is 2r

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product rule

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oh

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r is 8 yeah

ocean sealBOT Oct 8, 2021, 1:24 AM

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marc

ivory gulch Oct 8, 2021, 1:25 AM

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yes

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i think lol

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3/64pi = dh/dt

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bc

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6=128pih'

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divide by 128pi

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oh

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lol

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3/32pi = h'

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it's not

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did i round wrong or smth

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it says to 3 decimal places

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0.02984155182, i put 0.030

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yeah and the view an example thing uses the same method we did

hazy roost Oct 8, 2021, 1:31 AM

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Can you guys do my homework please

bright canyon Oct 8, 2021, 1:31 AM

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no

hazy roost Oct 8, 2021, 1:31 AM

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I don't have time

bright canyon Oct 8, 2021, 1:31 AM

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this chat id occupied

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is

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h

glass lichen Oct 8, 2021, 1:31 AM

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hazy roost I don't have time

not our problem.

ivory gulch Oct 8, 2021, 1:31 AM

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hazy roost Can you guys do my homework please

no

ivory gulch Oct 8, 2021, 1:31 AM

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bright canyon this chat id occupied

yes

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time to get new numbers

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have to use new numbers now

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ok forget everything

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here

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okay

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V=pi r^2 h

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v' = 2pi rr' h'

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damn

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no big

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its ok

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np

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im not doing anything lol

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just math and watching my fish

ocean sealBOT Oct 8, 2021, 1:36 AM

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marc

ivory gulch Oct 8, 2021, 1:37 AM

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yeah u dont need to use product rule

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bc u can plug in r before you derive

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np

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does this help

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diff numbers, its the view an example thing

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exactly

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and tried doing it again w the new numbers and still wrong

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8

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in^3/min

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yeah in the example

alpine sable Oct 8, 2021, 1:40 AM

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Can someone please help me I’m so lost

ivory gulch Oct 8, 2021, 1:40 AM

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omg

ivory gulch Oct 8, 2021, 1:40 AM

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alpine sable Can someone please help me I’m so lost

#❓how-to-get-help

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wait

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bruh

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i think we used 8

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instead of 7

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in the equation for volume of cylinder

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oh i meant hight

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oh yeah ok

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well

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i got part (a) right

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with the new numbers now

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ok so

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$V'=\frac{\pi }{3}\left(r^2h'+2hrr'\right)$

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ok there

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wait i cant pull that 2 out

ocean sealBOT Oct 8, 2021, 1:45 AM

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ski

ivory gulch Oct 8, 2021, 1:45 AM

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there

ocean sealBOT Oct 8, 2021, 1:45 AM

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marc

ivory gulch Oct 8, 2021, 1:47 AM

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doing rn

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no its ok

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ok i get radius at height of 4

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is 2

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pic is sending

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taking forever

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did you find tan(theta) = 2?

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r

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so radius = x=h/r

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yes sorry just got confused

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wait no bc x=r

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so r is there twice

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ok r = h_0 / r_0

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i know im trying

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ok can i just like walk u thru what im thinking

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$tan\left(\theta \right)=\frac{h}{r}$

ocean sealBOT Oct 8, 2021, 2:05 AM

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ski

ivory gulch Oct 8, 2021, 2:05 AM

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so

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$\theta =tan^{-1}\left(\frac{h}{r}\right)$

ocean sealBOT Oct 8, 2021, 2:06 AM

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ski

tough vessel Oct 8, 2021, 2:06 AM

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i forgot abt this lol

fallen nacelle Oct 8, 2021, 2:06 AM

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how come i cant ask question in the advanced mathematics stuff?

ivory gulch Oct 8, 2021, 2:06 AM

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bruh

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yes bro

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i see what you did but i dont understand

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can you just tell me where im going wrong

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pls

ocean sealBOT Oct 8, 2021, 2:07 AM

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marc

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marc

verbal beacon Oct 8, 2021, 2:07 AM

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hello

ocean sealBOT Oct 8, 2021, 2:07 AM

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marc

ivory gulch Oct 8, 2021, 2:08 AM

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i mean sure

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but idk how that applies

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so r=3

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$\frac{hr_0}{h_0}$

ocean sealBOT Oct 8, 2021, 2:13 AM

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ski

ivory gulch Oct 8, 2021, 2:13 AM

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derive

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to get r'

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what would h'_0 be tho

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oh ok

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why dont i just replace h_0 with the constant then

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r'=12h'

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okay

ivory gulch Oct 8, 2021, 2:16 AM

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ivory gulch r'=12h'

?

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im not asking you to

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im looking for h' right

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because im looking for the change in height /time

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how fast is the level falling

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that im looking for the change in height over time

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which is h'

alpine sable Oct 8, 2021, 2:19 AM

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does the binomial theorem requite 0^0=1?

ivory gulch Oct 8, 2021, 2:19 AM

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so i need to put in terms of h'

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so r'/12 = h'

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ok done

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$v'=\frac{\pi }{3}\left(r^2h'+2hrr'\right)$

ocean sealBOT Oct 8, 2021, 2:22 AM

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ski

ivory gulch Oct 8, 2021, 2:23 AM

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v' = 8

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radius and height depend on each other

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so idk either

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and r' and h' depend on each other

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so idk

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bruh

ivory gulch Oct 8, 2021, 2:23 AM

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ivory gulch which is h'

^

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#❓how-to-get-help

runic ravine Oct 8, 2021, 2:24 AM

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oh mb

ivory gulch Oct 8, 2021, 2:25 AM

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how can i use it when i dont know either

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because i dont know r or h

ivory gulch Oct 8, 2021, 2:25 AM

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ivory gulch radius and height depend on each other

.

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the problem wants h', or the change in height over time. I'm given the volume change over time

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no because everything else depends on each other

ivory gulch Oct 8, 2021, 2:26 AM

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ivory gulch radius and height depend on each other

.

ivory gulch Oct 8, 2021, 2:26 AM

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ivory gulch and r' and h' depend on each other

.

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ok i know that when the height is 4 the level in the pot is rising

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yeah idk

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but you're asking for what i know

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so

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there

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is it asking for how fast it's falling at 4?

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doesn't make that very clear if so

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the height that it wanted me to solve in part (a)

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the coffee

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in inches

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in the cylinder

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that's what i meant

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to say

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like fr

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but it doesn't make it clear that it's basing (b) off of (a)

plain token Oct 8, 2021, 2:30 AM

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(3x+2)(2x+7) , so uh whats the sum, i forgot

ivory gulch Oct 8, 2021, 2:30 AM

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are you being sarcastic haha

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or is it actually not clear

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ok cool

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bc i didn't think it was

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ok so i know h as well

hasty stream Oct 8, 2021, 2:31 AM

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guys i got a quick question am i allowed to ask here ?

ivory gulch Oct 8, 2021, 2:31 AM

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lmao

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occupied

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okay so since i know the height at that point

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and i have an equation to solve radius given height

hasty stream Oct 8, 2021, 2:31 AM

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my bad

ivory gulch Oct 8, 2021, 2:32 AM

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r=3

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$v'=\frac{\pi }{3}\left(9h'+24r'\right)$

ocean sealBOT Oct 8, 2021, 2:32 AM

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ski

ivory gulch Oct 8, 2021, 2:32 AM

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occupied

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don't do it lol

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okay so now what

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i could solve with substitution

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because r'=12h'

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$8=\frac{\pi }{3}\left(297h'\right)$

ocean sealBOT Oct 8, 2021, 2:35 AM

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ski

ivory gulch Oct 8, 2021, 2:36 AM

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its wrong

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wind river Oct 8, 2021, 2:41 AM

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ivory gulch Oct 8, 2021, 2:41 AM

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$\frac{h'}{2}=r'$

ocean sealBOT Oct 8, 2021, 2:41 AM

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ski

ivory gulch Oct 8, 2021, 2:41 AM

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wind river

#❓how-to-get-help

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read the rules pls

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,rotate

ocean sealBOT Oct 8, 2021, 2:43 AM

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ivory gulch Oct 8, 2021, 2:43 AM

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good?

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forgot to write but h=4

cunning fractal Oct 8, 2021, 2:44 AM

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ivory gulch Oct 8, 2021, 2:44 AM

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cunning fractal

#❓how-to-get-help read rules please

cunning fractal Oct 8, 2021, 2:44 AM

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I do not understand any of there

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i need helo

ivory gulch Oct 8, 2021, 2:44 AM

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cunning fractal i need helo

read rules

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okay ill continue the

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n

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yes

cunning fractal Oct 8, 2021, 2:45 AM

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sorry

ivory gulch Oct 8, 2021, 2:45 AM

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last message 1 min ago

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,rotate

ocean sealBOT Oct 8, 2021, 2:45 AM

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ivory gulch Oct 8, 2021, 2:46 AM

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good?

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forgot the pi

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other than that

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where do i plug it

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and what do i look for

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original

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or derived

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just plugged into mymathlab and got it right

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so finally done w that terrible problem

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one more

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god damn

alpine sable Oct 8, 2021, 2:51 AM

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is this function continuous or discontinuous?

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how do i tell the difference

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the dots are the limit

ivory gulch Oct 8, 2021, 2:52 AM

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check if the right and left handed limits are equal to each other

alpine sable Oct 8, 2021, 2:52 AM

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uhhh im sure

ivory gulch Oct 8, 2021, 2:52 AM

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if u want to solve algebraically

alpine sable Oct 8, 2021, 2:52 AM

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is this a trick question

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at just x=-3 is it dne

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because those two functions dont have the same y value at x

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1

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and at the right its 2

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I MEAN

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0

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so it would be 0, 1, dne, and by elimination not continous

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but why is it not continuous

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is it because the lines stop there

ocean sealBOT Oct 8, 2021, 2:55 AM

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marc

alpine sable Oct 8, 2021, 2:56 AM

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ohhh that makes a lot of sense

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thank you

naive kestrel Oct 8, 2021, 2:57 AM

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who can help me with these

upbeat gorge Oct 8, 2021, 2:58 AM

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Get two points and get the slope

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then you can either use point-slope and convert it to slope-intercept

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Or use the y-intercept that’s indicated on the graph

naive kestrel Oct 8, 2021, 3:00 AM

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if i can find the equation then i can convert it into slope form

alpine sable Oct 8, 2021, 3:03 AM

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do you still need help

candid nova Oct 8, 2021, 3:04 AM

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is this channel free

alpine sable Oct 8, 2021, 3:04 AM

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not sure

candid nova Oct 8, 2021, 3:04 AM

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he isn't responding so i'll ask my question here because I pinged helpers in another channel and didnt get any answers

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do you know how whether i need to use Permutations or combinations for this question

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A sock drawer contains 18 individual socks, six of which are black, 10 of which are white, and two of which are
zebra-print. You wish to randomly select two socks from this sock drawer.

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What is the probability that your selection will consist of matching socks (socks of the same color)?

misty path Oct 8, 2021, 3:06 AM

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I have 4 math ixl due in an hour 😭

tight locust Oct 8, 2021, 3:13 AM

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,w 2/18 x 1/17 + 10/18 x 9/17 + 6/18 x 5/17

ocean sealBOT Oct 8, 2021, 3:13 AM

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Results provided by WolframAlpha

Click here to refine your query online
Upgrade to WolframAlpha Pro!

candid nova Oct 8, 2021, 3:14 AM

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tight locust ,w 2/18 x 1/17 + 10/18 x 9/17 + 6/18 x 5/17

could i also do 2C2 + 6C2+ 10C2 / 18C2?

tight locust Oct 8, 2021, 3:15 AM

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are there supposed to be parantheses in that expression?

candid nova Oct 8, 2021, 3:15 AM

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(2C2 + 6C2 + 10C2) / 18C2

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61/153

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i think it should equal that

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yeah it does

tight locust Oct 8, 2021, 3:16 AM

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yeah nice work

candid nova Oct 8, 2021, 3:16 AM

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so I have a follow up that I was struggling on,

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if It asks me to find the probability that exactly one of my socks will be black

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is it the same as (6C1) +(12C1) / (18C2)

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my logic is that you only need exactly one, so select 1 from 6 black socks and the other sock will be a non-black which are 12

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is that correct?

tight locust Oct 8, 2021, 3:19 AM

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,w 6/18 * 12/17

ocean sealBOT Oct 8, 2021, 3:19 AM

#

Results provided by WolframAlpha

Click here to refine your query online
Upgrade to WolframAlpha Pro!

candid nova Oct 8, 2021, 3:19 AM

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hmm

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ok then by the same logic, if i wanted to find the probability of just selecting zebra print socks, would that just be 2/18 * 1/17? @tight locust

tight locust Oct 8, 2021, 3:25 AM

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yeah checks out

candid nova Oct 8, 2021, 3:26 AM

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alright and I had one question I was hoping you could help me on, i'm not sure if its super simple or very tricky but I got different answers from everyone that i asked

tight locust Oct 8, 2021, 3:26 AM

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ok

candid nova Oct 8, 2021, 3:26 AM

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thanks

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Consider two independent events, A and B, in a sample space. The probability that only A occurs is 0.3 and the
probability that at least one of the two events occurs is 0.34

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so basically in this question im confused what the probability that ONLY A occurs means

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what does it mean by the probability that only A is? Does that mean the set P(A and B^c) ?

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or is it just P(A) = 0.3

tight locust Oct 8, 2021, 3:27 AM

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P(A and not B)

candid nova Oct 8, 2021, 3:27 AM

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alright so do u know how i would calculate Pb) using that info

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P(b)

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i just have P(A u B) and P(A and Not B)

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how do i use that to get P(b) lol

tight locust Oct 8, 2021, 3:29 AM

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00
01
10
11

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2^2 = 4

candid nova Oct 8, 2021, 3:29 AM

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what

tight locust Oct 8, 2021, 3:37 AM

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P(A and not B) = P(A)(1-P(B)) = 0.3
P(A or B) = P(A) + P(B) = 0.34

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,w a(1-b) = 0.3, a+b = 0.34

ocean sealBOT Oct 8, 2021, 3:38 AM

#

Results provided by WolframAlpha

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Upgrade to WolframAlpha Pro!

candid nova Oct 8, 2021, 3:39 AM

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so what is a then

tight locust Oct 8, 2021, 3:39 AM

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huh that's weird

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i don't quite recall the formula for P(A and not B)

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isn't it just P(A)(1-P(B)

candid nova Oct 8, 2021, 3:40 AM

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but we dont have P(A)

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unless you're saying that ONLY A is P(A)

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but i thought we're saying that its P(A and Not B)

tight locust Oct 8, 2021, 3:41 AM

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that's why we have the system of equations. two equations, two variables

candid nova Oct 8, 2021, 3:41 AM

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i've never had to do solve a system of equations in stats lol

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im pretty sure that cant be the correct way

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you know what nevermind this

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I'll figure it out somehow later, its not really important rn

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can you check and see if the answer to this is just 12 P 12

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A person has twelve favorite songs. Five of them are pop, three of them are rock, two of them are metal, one is
classical, and one is from a soundtrack. The person wishes to make a playlist of all of these songs by randomly
arranging them (note: the playlist must consist of all 12 songs).

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How many different unique playlists are possible?

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is this just 12P12

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@tight locust

tight locust Oct 8, 2021, 3:45 AM

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no it's right. i double checked that math. P(B) is about 3%

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talking about the previous question

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https://www.wolframalpha.com/input/?i=A-AB+%3D+0.3%2C+A%2BB+%3D+0.34

A-AB = 0.3, A+B = 0.34 - Wolfram|Alpha

Wolfram|Alpha brings expert-level knowledge and capabilities to the broadest possible range of people—spanning all professions and education levels.

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where A and B are P(A) and P(B) respectively

tight locust Oct 8, 2021, 3:49 AM

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candid nova is this just 12P12

yeah that works. 12!/(12-12)! = 12!

candid nova Oct 8, 2021, 3:49 AM

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tight locust yeah that works. 12!/(12-12)! = 12!

and then if the question is How many different unique playlists are possible? is the answer just 2P2 * 10P10?

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because u gotta permute the 2 metal songs and then the rest of the 10 songs in the playlist

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or would it be 2P2 * 10C10

tight locust Oct 8, 2021, 3:50 AM

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you literally asked me the same question twice in a row

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and somehow arrived at a different answer for both of them

candid nova Oct 8, 2021, 3:50 AM

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oh oops

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lol

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How many playlists exist where the first song in the playlist is metal?

tight locust Oct 8, 2021, 3:51 AM

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2!*10!

candid nova Oct 8, 2021, 3:51 AM

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for this part it would just be 2P2 10P10? or 2P2 10C10

tight locust Oct 8, 2021, 3:51 AM

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you realize that nPn = n!

candid nova Oct 8, 2021, 3:51 AM

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yeah

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but the proper way of writing it is to use P right?

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because we're doing a permutation

tight locust Oct 8, 2021, 3:52 AM

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doesn't make a difference really. depends on what your teacher asks for

candid nova Oct 8, 2021, 3:52 AM

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i see

tight locust Oct 8, 2021, 3:52 AM

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and you also realize that nCn is just 1

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always

candid nova Oct 8, 2021, 3:52 AM

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and for the last 2 questions I got this. I might as well check these practice questions since they're the last two left xD

candid nova Oct 8, 2021, 3:53 AM

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tight locust and you also realize that nCn is just 1

yeah

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How many playlists exist where all the songs of the same genre are grouped together?

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for this i got 5! * 3! * 2! / 12!

eternal arrow Oct 8, 2021, 3:54 AM

#

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Does this second question make sense?

buoyant kayak Oct 8, 2021, 3:54 AM

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yes

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you know what b is as well

tight locust Oct 8, 2021, 3:55 AM

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candid nova How many playlists exist where all the songs of the same genre are grouped toget...

(5!)(5!)(3!)(2!)(1!)(1!)

buoyant kayak Oct 8, 2021, 3:55 AM

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think of it as $2x^2+0x$

ocean sealBOT Oct 8, 2021, 3:55 AM

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a disappointing son

tight locust Oct 8, 2021, 3:55 AM

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occupied channel

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move

buoyant kayak Oct 8, 2021, 3:55 AM

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yes

candid nova Oct 8, 2021, 3:55 AM

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tight locust (5!)(5!)(3!)(2!)(1!)(1!)

all divided by 12! right?

buoyant kayak Oct 8, 2021, 3:55 AM

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👍

tight locust Oct 8, 2021, 3:55 AM

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candid nova all divided by 12! right?

no

candid nova Oct 8, 2021, 3:56 AM

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wait a minute

buoyant kayak Oct 8, 2021, 3:56 AM

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yes

candid nova Oct 8, 2021, 3:56 AM

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we're grouping them together so they all have to appear together

tight locust Oct 8, 2021, 3:56 AM

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you would only divide by 12! if you wanted the probability

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but you asked for the number

candid nova Oct 8, 2021, 3:56 AM

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oh ok

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but you have 5!5!3!2!1!1!

tight locust Oct 8, 2021, 3:56 AM

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yes

candid nova Oct 8, 2021, 3:57 AM

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shouldn't it be 5!3!2!1!1!

tight locust Oct 8, 2021, 3:57 AM

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no

candid nova Oct 8, 2021, 3:57 AM

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because we're grouping all them together

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by genre

tight locust Oct 8, 2021, 3:57 AM

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how many genres are there?

candid nova Oct 8, 2021, 3:57 AM

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5 total

tight locust Oct 8, 2021, 3:57 AM

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and how many songs are in each genre?

candid nova Oct 8, 2021, 3:57 AM

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and in pop there's 5 songs, 3 from rock, 2 metal, 1 classical and 1 soundtrack

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so within the first one, it should be 5P5 because the order does matter

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since within each genre, each song is different from another

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resulting in a different playlist no?

tight locust Oct 8, 2021, 3:58 AM

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no

candid nova Oct 8, 2021, 3:59 AM

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why not

tight locust Oct 8, 2021, 3:59 AM

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how many ways can the pop songs be ordered?

candid nova Oct 8, 2021, 3:59 AM

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5

tight locust Oct 8, 2021, 4:00 AM

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no.

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how many permutations of a 5 element set?

candid nova Oct 8, 2021, 4:01 AM

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sorry 120

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5P5

tight locust Oct 8, 2021, 4:01 AM

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yes

candid nova Oct 8, 2021, 4:01 AM

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then we do the same for rock, metal classical and soundtrack

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so 3! 2! 1! 1!

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isn't that it?

tight locust Oct 8, 2021, 4:02 AM

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so what's your final answer?

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just 5! 3! 2! 1! 1!

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?

candid nova Oct 8, 2021, 4:02 AM

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1440

tight locust Oct 8, 2021, 4:02 AM

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Incorrect.

stoic cloud Oct 8, 2021, 4:02 AM

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How do you get the roots 4i and -4i from this?

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candid nova Oct 8, 2021, 4:02 AM

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why

tight locust Oct 8, 2021, 4:02 AM

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stoic cloud How do you get the roots 4i and -4i from this?

occupied channel. move

tight locust Oct 8, 2021, 4:03 AM

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candid nova why

how many permutations of a 5 element set?

candid nova Oct 8, 2021, 4:03 AM

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120

tight locust Oct 8, 2021, 4:03 AM

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so 1440*120 = ?

candid nova Oct 8, 2021, 4:03 AM

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oh thats why

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wait what

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why are we doing another 5P5

tight locust Oct 8, 2021, 4:04 AM

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because there are 5 different genres

candid nova Oct 8, 2021, 4:04 AM

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oh so you're saying the order of the grouping also matters

tight locust Oct 8, 2021, 4:04 AM

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yes.

candid nova Oct 8, 2021, 4:04 AM

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so the order of grouping of the genres and the grouping WITHIN the genres

tight locust Oct 8, 2021, 4:04 AM

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yes.

candid nova Oct 8, 2021, 4:04 AM

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sheeeeshhhh

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haha

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makes sense now

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172,800

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that seems like a crazy big number tho

tight locust Oct 8, 2021, 4:05 AM

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haha

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it is

candid nova Oct 8, 2021, 4:05 AM

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and if we wanted to do it for just one of the genres

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like pop for example

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how many playlists exist if all pop songs grouped together

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that would be 5! * 12! then?

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sorry

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5! * 7! * 2!

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right?

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5! from pop, 7 from rest!, 2 for number of groups

tight locust Oct 8, 2021, 4:07 AM

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5! * 11!

candid nova Oct 8, 2021, 4:07 AM

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why 11!

tight locust Oct 8, 2021, 4:07 AM

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wait my bad

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5! 7!

candid nova Oct 8, 2021, 4:07 AM

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and then another 2! right?

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because there's 2 groups

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pop and non pop

tight locust Oct 8, 2021, 4:09 AM

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no my bad. damn i'm off today. it should be 5! (1+3+2+1+1)! = 5! 8!

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there are 8 elements in the set

candid nova Oct 8, 2021, 4:09 AM

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isn't there only 7

tight locust Oct 8, 2021, 4:10 AM

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pop + 7 other songs

candid nova Oct 8, 2021, 4:10 AM

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why is pop included

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it is its own seperate

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because we're grouping by pop

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so the orders can be, pop and non pop. or Non pop and pop

tight locust Oct 8, 2021, 4:10 AM

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yeah but the order in which the pop group appears still matters

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or it could be:

candid nova Oct 8, 2021, 4:10 AM

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tight locust yeah but the order in which the pop group appears still matters

yeah and there's only two ways that can happen

tight locust Oct 8, 2021, 4:11 AM

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some non pop, pop, some non pop

candid nova Oct 8, 2021, 4:11 AM

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either in beginning or at end

tight locust Oct 8, 2021, 4:11 AM

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you are wrong

candid nova Oct 8, 2021, 4:11 AM

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no but the pop has to be grouped together

tight locust Oct 8, 2021, 4:11 AM

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it is

candid nova Oct 8, 2021, 4:11 AM

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How many playlists exist where all of the pop songs are grouped together?

tight locust Oct 8, 2021, 4:11 AM

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some non pop, pop, some non pop

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the other songs are allowed to permute freely

candid nova Oct 8, 2021, 4:11 AM

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oh yeah true

tight locust Oct 8, 2021, 4:12 AM

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5! 8!

candid nova Oct 8, 2021, 4:12 AM

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i see

proud knot Oct 8, 2021, 4:12 AM

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the answer to the second one is 4/25, how?

Screen_Shot_2021-10-08_at_8.10.35_AM.png

candid nova Oct 8, 2021, 4:12 AM

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thanks man

tight locust Oct 8, 2021, 4:12 AM

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you good?

candid nova Oct 8, 2021, 4:13 AM

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yeah, so each genre together was just 5!3!2!1!1!5!

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and just pop together is 5! 8!

tight locust Oct 8, 2021, 4:13 AM

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yep

candid nova Oct 8, 2021, 4:13 AM

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and the number of different unique playlists is just 12!

tight locust Oct 8, 2021, 4:14 AM

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yes

candid nova Oct 8, 2021, 4:14 AM

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and for playlists starting with metal just 2P2 * 10!

tight locust Oct 8, 2021, 4:14 AM

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yeah

candid nova Oct 8, 2021, 4:15 AM

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thanks man i appreciate it

tight locust Oct 8, 2021, 4:16 AM

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alright gg

candid nova Oct 8, 2021, 4:18 AM

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gg lol

inner sequoia Oct 8, 2021, 4:24 AM

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why does this happen

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wouldnt negative exponent property make y^-12 into 1/y^12

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so it would be
7^3z^15

2^3(1/y^12)

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why does the y^12 end up at the top

alpine sable Oct 8, 2021, 4:28 AM

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1/(ab)+ab
Find min value for a,b > 0. a+b≥1.

inner sequoia Oct 8, 2021, 4:28 AM

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?

alpine sable Oct 8, 2021, 4:29 AM

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inner sequoia so it would be 7^3z^15 ----------- 2^3(1/y^12)

1/(1/2) = 1÷1/2 = 1×2/1 = 2

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Use this reasoning.

inner sequoia Oct 8, 2021, 4:29 AM

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wait

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(1/1)/2 is 1/2

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1x2/1 is 2

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2 isnt 1/2?

alpine sable Oct 8, 2021, 4:30 AM

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I said 1/(1/2) not (1/1)/2

inner sequoia Oct 8, 2021, 4:30 AM

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OH

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oops my bad

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so

f/2(1/x) = fx/2?

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OH WAIT bruh i had the thing on my paper
and realized there were no addition signs on my paper ;-;

alpine sable Oct 8, 2021, 4:32 AM

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inner sequoia so f/2(1/x) = fx/2?

Yes.

inner sequoia Oct 8, 2021, 4:32 AM

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i was so confused bcs it was supposed to be multiplying and not adding then i realized that it was multiplying

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yeah my bad i just didnt notice

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divide by number = multiply by reciprocal

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thanks for the help0

runic pulsar Oct 8, 2021, 4:33 AM

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#

how do i work this out?

lilac nest Oct 8, 2021, 4:36 AM

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You know what the lim x->5 g(x) is equal to, so you can substitute it into the result you wrote instead of writing g(x)

alpine sable Oct 8, 2021, 4:36 AM

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runic pulsar

g(5) = -2.

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@lilac nest can you help me?

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There's just a misunderstanding so want to clear it.

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1/(ab)+ab
Find min value for a,b > 0. a+b≥1.

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This.

runic pulsar Oct 8, 2021, 4:39 AM

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its not g(5)-2

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@lilac nest im not quite sure what you mean, do i know what its equal to lol?

alpine sable Oct 8, 2021, 4:40 AM

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runic pulsar <@!733586866003116074> im not quite sure what you mean, do i know what its equal...

Read first line of your question.

lilac nest Oct 8, 2021, 4:40 AM

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runic pulsar its not g(5)-2

g(5)=-2

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So you can substitute the G(5) with -2

alpine sable Oct 8, 2021, 4:41 AM

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alpine sable 1/(ab)+ab Find min value for a,b > 0. a+b≥1.

This please.
Shouldn't the answer be 2?@lilac nest

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Oh, NVM. Wolfram detected it.

lapis goblet Oct 8, 2021, 4:49 AM

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@alpine sable

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Post it here

alpine sable Oct 8, 2021, 4:50 AM

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adrea is helping me in 3 already

lapis goblet Oct 8, 2021, 4:50 AM

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Ok sure

sour dove Oct 8, 2021, 4:52 AM

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@fickle relic It's hard to read, can you crop or post a screenshot that's zoomed in a bit?

fickle relic Oct 8, 2021, 4:53 AM

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sour dove <@!460563182684209152> It's hard to read, can you crop or post a screenshot that...

Ok

#

#

@sour dove

sour dove Oct 8, 2021, 4:54 AM

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thank you

granite wind Oct 8, 2021, 4:54 AM

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D

fickle relic Oct 8, 2021, 4:54 AM

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K I got D too

sour dove Oct 8, 2021, 4:55 AM

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yep! nicely done.

fickle relic Oct 8, 2021, 4:55 AM

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its B

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lmao

granite wind Oct 8, 2021, 4:56 AM

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your school is dumb

fickle relic Oct 8, 2021, 4:56 AM

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rip

sour dove Oct 8, 2021, 4:56 AM

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lol

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wut?

fickle relic Oct 8, 2021, 4:56 AM

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yeah some of these answer's don't seem right

sour dove Oct 8, 2021, 4:56 AM

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it's a polynomial > 0, there's no discontinuities

eternal arrow Oct 8, 2021, 4:58 AM

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Could somebody verify if my answer makes sense for the top wuestion)

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I have my solutions

sour dove Oct 8, 2021, 5:00 AM

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@fickle relic
Oh wait...
x(x^2 + 7x + 12) > 0
x(x + 3)(x+4) > 0
so x can't equal 0, -3, or -4

fickle relic Oct 8, 2021, 5:01 AM

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yeah I got that after the fact

sour dove Oct 8, 2021, 5:01 AM

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honestly it's kind of weird question, because D works for what they're asking for too

fickle relic Oct 8, 2021, 5:02 AM

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yeah it does

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B and d work

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I guess b is “more correct”

sour dove Oct 8, 2021, 5:02 AM

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@eternal arrow your top solution is correct

eternal arrow Oct 8, 2021, 5:03 AM

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Can you check if bottom right 2 are correct?

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Im not sure if they’re

sour dove Oct 8, 2021, 5:06 AM

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@eternal arrow top bottom right is mostly correct, except -5 can't be an answer, since you can't have negatives in a log statement. For example log(-5) does not exist

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so the answer is just 5

eternal arrow Oct 8, 2021, 5:06 AM

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Ye thats what I out

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Put*

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i got that cleared up

sour dove Oct 8, 2021, 5:08 AM

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bottom right is correct

wicked rampart Oct 8, 2021, 5:13 AM

#

#

can i have help for graphing these? i'm not allowed to use a graphing calculator

eternal arrow Oct 8, 2021, 5:14 AM

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sour dove bottom right is correct

Thanks

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@wicked rampart bro 😩 good luck. I would advise you to use your graphing calc to check your answer

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I would try but im heading off to bead

amber iron Oct 8, 2021, 5:36 AM

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How do I approximate sqrt(38) via linearization

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2^2 + 3^2 + 5^2 = 38, im supposed to use the 3d version of linearization

fast oak Oct 8, 2021, 5:39 AM

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for f(x)=2x^+1 and g(x)=x^-7 find (f+g)(x)

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general math

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lapis hedge Oct 8, 2021, 5:46 AM

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fast oak for f(x)=2x^+1 and g(x)=x^-7 find (f+g)(x)

Add both f(x) and g(x) together, (2x^2+1)+(x^2-7)

fast oak Oct 8, 2021, 5:46 AM

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ok

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2x+x^ or x^+2x?

lapis hedge Oct 8, 2021, 5:49 AM

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I'm not sure I understand

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2x^2+x^2?

fast oak Oct 8, 2021, 5:50 AM

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2x+x^ + 1-7

lapis hedge Oct 8, 2021, 5:50 AM

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Yes you can rewrite it like that

fast oak Oct 8, 2021, 5:50 AM

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ok then what nxt?

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i solve first 2x+x^ ?

lapis hedge Oct 8, 2021, 5:51 AM

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Add them, 2x^2+x^2 =

fast oak Oct 8, 2021, 5:51 AM

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ok

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x^-2x-8?

lapis hedge Oct 8, 2021, 5:56 AM

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For 6.?

fast oak Oct 8, 2021, 5:56 AM

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x^+2x-6

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-x^+2x-6?

lapis hedge Oct 8, 2021, 5:59 AM

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What

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Which problem are you solving

fast oak Oct 8, 2021, 6:00 AM

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additon of function and subtract of function

lapis hedge Oct 8, 2021, 6:00 AM

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... the number

fast oak Oct 8, 2021, 6:01 AM

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here the given f(x)= 2x+1 g(x)=x^-7 FIND (F-G)(X)

lapis hedge Oct 8, 2021, 6:02 AM

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JUST SAY NUMBER 5, ok

fast oak Oct 8, 2021, 6:02 AM

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ye

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sorry

lapis hedge Oct 8, 2021, 6:03 AM

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So your answer for number 5 is

fast oak Oct 8, 2021, 6:03 AM

#

-x^+2x-6

lapis hedge Oct 8, 2021, 6:04 AM

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incorrect

fast oak Oct 8, 2021, 6:04 AM

#

why

lapis hedge Oct 8, 2021, 6:04 AM

#

$$(2x+1)-(x^2-7)$$

ocean sealBOT Oct 8, 2021, 6:04 AM

#

Leslie Miller

fast oak Oct 8, 2021, 6:04 AM

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why negative

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ohh

#

(f-g)

lapis hedge Oct 8, 2021, 6:05 AM

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You forgot to distribute the negative

fast oak Oct 8, 2021, 6:05 AM

#

#

i know the anaswer

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-x^+2x+8

lapis hedge Oct 8, 2021, 6:06 AM

#

correct

fast oak Oct 8, 2021, 6:06 AM

#

aw

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my 1 to 4 incorrect too

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becuz of +

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( ) + ( )

lapis hedge Oct 8, 2021, 6:07 AM

#

?

fast oak Oct 8, 2021, 6:08 AM

#

#

can u check what number is wrong

lapis hedge Oct 8, 2021, 6:20 AM

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fast oak can u check what number is wrong

All good except 3

fast oak Oct 8, 2021, 6:25 AM

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ok ty

alpine sable Oct 8, 2021, 6:26 AM

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Hi can someone help me with part (c)

limpid rock Oct 8, 2021, 6:32 AM

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arrange all five women in 5! ways

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then choose 4 out of the 6 empty spaces and arrange the men in them in 6C4*4! ways

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so finally 6C4*4! *5!

neat laurel Oct 8, 2021, 6:34 AM

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hello

#

can someone please help me with this math problem

#

Screen_Shot_2021-10-07_at_11.33.29_PM.png

#

this is my work so far

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Screen_Shot_2021-10-07_at_11.33.41_PM.png

surreal radish Oct 8, 2021, 6:39 AM

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hi what does this mean when constructing a matrix

#

can anyone pls help me thanks

rapid heron Oct 8, 2021, 6:42 AM

#

@surreal radish I think you have to find the Determinant.

#

∆

tight locust Oct 8, 2021, 6:43 AM

#

what are i and j?

#

vectors?

surreal radish Oct 8, 2021, 6:44 AM

#

like in matrices

#

general form

limpid rock Oct 8, 2021, 6:44 AM

#

neat laurel

in b) why did you write l=8-w? thats from a part a). b) is different from a)

neat laurel Oct 8, 2021, 6:45 AM

#

oh ok

surreal radish Oct 8, 2021, 6:45 AM

#

#

this was the question

neat laurel Oct 8, 2021, 6:45 AM

#

i erased it

rigid wind Oct 8, 2021, 6:45 AM

#

absolute value

surreal radish Oct 8, 2021, 6:46 AM

#

surreal radish

and i dont understand what this means

#

rigid wind Oct 8, 2021, 6:46 AM

#

absolute value

surreal radish Oct 8, 2021, 6:46 AM

#

can anyone help pls thanks

rapid heron Oct 8, 2021, 6:46 AM

#

@surreal radish That's modulus

rigid wind Oct 8, 2021, 6:46 AM

#

(1,2), (2,1), (2,3), (3,2)

neat laurel Oct 8, 2021, 6:46 AM

#

limpid rock in b) why did you write l=8-w? thats from a part a). b) is different from a)

what should i do instead?

limpid rock Oct 8, 2021, 6:46 AM

#

do l = area/w

neat laurel Oct 8, 2021, 6:46 AM

#

why?

surreal radish Oct 8, 2021, 6:47 AM

#

rapid heron <@330440061814439947> That's modulus

oh , can u pls help me

limpid rock Oct 8, 2021, 6:47 AM

#

surreal radish can anyone help pls thanks

basically the difference of i and j can be either 1 or -1

surreal radish Oct 8, 2021, 6:48 AM

#

oh ok, thanks

#

so if they were likeI i-j I= 3

#

then would that mean the difference can be either - 3 or 3

rapid heron Oct 8, 2021, 6:49 AM

#

limpid rock basically the difference of i and j can be either 1 or -1

Yes

rigid wind Oct 8, 2021, 6:49 AM

#

no

neat laurel Oct 8, 2021, 6:49 AM

#

limpid rock do l = area/w

is this correct?

#

limpid rock Oct 8, 2021, 6:49 AM

#

surreal radish then would that mean the difference can be either - 3 or 3

yeah kinda but thats not possible in 3x3 matrix

rigid wind Oct 8, 2021, 6:49 AM

#

matrix A, element a_ij, when i and j differs by 1, a_ij = x

alpine sable Oct 8, 2021, 6:50 AM

#

limpid rock then choose 4 out of the 6 empty spaces and arrange the men in them in 6C4*4! wa...

Can you explain this step further pls

limpid rock Oct 8, 2021, 6:50 AM

#

neat laurel

yeah mostly just dont forget to mention the domains :)

neat laurel Oct 8, 2021, 6:50 AM

#

domain of the answer ?

fast oak Oct 8, 2021, 6:50 AM

#

i-j = /-1

neat laurel Oct 8, 2021, 6:50 AM

#

just checking^

limpid rock Oct 8, 2021, 6:51 AM

#

the way you mentioned D:(0,8) in the first part

neat laurel Oct 8, 2021, 6:51 AM

#

but it should be domain of the p(w) thing i just solved right?

magic jacinth Oct 8, 2021, 6:51 AM

#

what grade math is this

fast oak Oct 8, 2021, 6:51 AM

#

any

limpid rock Oct 8, 2021, 6:52 AM

#

neat laurel but it should be domain of the p(w) thing i just solved right?

basicallyyeah thats what i meant sorry for not bieng clear

neat laurel Oct 8, 2021, 6:52 AM

#

oh no dw, tysm !

limpid rock Oct 8, 2021, 6:52 AM

#

alpine sable Can you explain this step further pls

ummmm to be able to separate the men you have to put them in between of the gaps formed after women are placed

alpine sable Oct 8, 2021, 6:53 AM

#

I don’t understand why you did 6C4 * 4!

#

Wouldn’t it be 6P4 then?

limpid rock Oct 8, 2021, 6:54 AM

#

yep thats true

#

i was just trying to be clear

#

sorry if i ended up being more confusing

alpine sable Oct 8, 2021, 6:54 AM

#

Ah I see

#

No problem

#

Also how did you know there were 6 empty spaces?

#

I mean without actually visually representing the problem

limpid rock Oct 8, 2021, 6:55 AM

#

well four spaces in between the women and two on either end

alpine sable Oct 8, 2021, 6:56 AM

#

Makes sense

#

Thanks so much

magic jacinth Oct 8, 2021, 6:56 AM

#

why's factor of 10 4

#

i dont get it

#

cocatThink

limpid rock Oct 8, 2021, 6:57 AM

#

thats n(H) ie number of factors of 10

#

1,2,5,10

magic jacinth Oct 8, 2021, 6:57 AM

#

oh

#

thanks

wooden current Oct 8, 2021, 6:58 AM

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hi im new, any one took stats in here?

fast oak Oct 8, 2021, 7:02 AM

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Is this correct

alpine sable Oct 8, 2021, 7:04 AM

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Idk

fast oak Oct 8, 2021, 7:04 AM

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general math

limpid rock Oct 8, 2021, 7:05 AM

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fast oak

yep correct but you really need to be little more oraganised

wooden current Oct 8, 2021, 7:16 AM

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which values do i use to find the evidence? (both a & b) ty!!!

rapid heron Oct 8, 2021, 7:18 AM

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Anyone?

limpid rock Oct 8, 2021, 7:20 AM

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9?

rapid heron Oct 8, 2021, 7:23 AM

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limpid rock 9?

But then how "3 friends left with 4 apples"?

limpid rock Oct 8, 2021, 7:23 AM

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cuz kyle in the end doesnt eat half her apples

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you start with x, kyle eats three so x-3, then splits in three so each has (x-3)/3. but then other two eat half of theirs

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so you finally end up with (x-3)/3, (x-3)/6, (x-3)/6 apples

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add them and equate to 4

rapid heron Oct 8, 2021, 7:25 AM

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limpid rock you start with x, kyle eats three so x-3, then splits in three so each has (x-3)...

Thanks bro you're right 👍

magic jacinth Oct 8, 2021, 7:33 AM

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fast oak

what grade math is that?? it look so complicated

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cocatThink

fast oak Oct 8, 2021, 7:35 AM

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Is this corect

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Gen math

magic jacinth Oct 8, 2021, 7:37 AM

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idk

fast oak Oct 8, 2021, 7:37 AM

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Grade 11

magic jacinth Oct 8, 2021, 7:37 AM

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angerysad

alpine sable Oct 8, 2021, 7:37 AM

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its correct

fast oak Oct 8, 2021, 7:37 AM

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Ok ty

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What if ( f-g ) (x)

I use this apply rule (a)=a
Distribute law -(a+b)= -a -b

alpine sable Oct 8, 2021, 7:40 AM

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no

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(f-g)(x) = f(x) - g(x)

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similarly

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(f * g) (x) = f(x) * g(x)

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same for division

magic jacinth Oct 8, 2021, 7:43 AM

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cocatThink

fast oak Oct 8, 2021, 7:47 AM

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x²+8 answer

drowsy fable Oct 8, 2021, 7:58 AM

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is there a logical symbol for "can be"

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and for "or"

fast oak Oct 8, 2021, 8:04 AM

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?

alpine sable Oct 8, 2021, 8:04 AM

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Help plz

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424

midnight marsh Oct 8, 2021, 8:06 AM

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@alpine sable do 8x3 then add that to 50x8 and you get 424

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as seeker said

alpine sable Oct 8, 2021, 8:07 AM

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Ty

flat remnant Oct 8, 2021, 8:07 AM

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hi

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what are the column vectors of A and B? my material doesnt have good examples so i dont understand

placid zinc Oct 8, 2021, 8:09 AM

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Literally just the columns as vectors

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So A has two column vectors. They are:
(3,-2,1) and (1,1,0)

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I should write those as vertical vectors but I am lazy

flat remnant Oct 8, 2021, 8:10 AM

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so what would this be then

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[3,-2,1 1,1,0]?

midnight marsh Oct 8, 2021, 8:10 AM

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flat remnant what are the column vectors of A and B? my material doesnt have good examples so...

B is (1,-1 and 3) and (-3, 1/2 and 0)

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in the same format as kay ex

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kaynex

placid zinc Oct 8, 2021, 8:11 AM

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flat remnant so what would this be then

Assuming that a1 and a2 are scalars;
then A's column vectors are (a1) and (a2)

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But I get an odd feeling they're not

midnight marsh Oct 8, 2021, 8:11 AM

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assuming the same for b, B’s column vectors are b1 and b2

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which is probably wrong

alpine sable Oct 8, 2021, 8:12 AM

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flat remnant so what would this be then

a1 is [3, -2, 1] vertically

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Like that for all of them

flat remnant Oct 8, 2021, 8:12 AM

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i would send the whole question but its not in english and im not good at math terms in english

midnight marsh Oct 8, 2021, 8:12 AM

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send it anyways

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so we get an understanding

flat remnant Oct 8, 2021, 8:13 AM

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"present matrices A and B using their column vectors, aka write the matrices like A = [a1 a2] and B = [b1 b2]"

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smth like that

placid zinc Oct 8, 2021, 8:14 AM

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Okay. So a1 represents the column itself

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a1 = (3,-2,1)

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ect.

flat remnant Oct 8, 2021, 8:14 AM

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do they go on different rows then

placid zinc Oct 8, 2021, 8:14 AM

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"they"?

flat remnant Oct 8, 2021, 8:14 AM

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a1 and a2

placid zinc Oct 8, 2021, 8:15 AM

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a1 is (implied) to be the left column

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a2 is the right column

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"column" means a vertical line of numbers

flat remnant Oct 8, 2021, 8:16 AM

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yes i know

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so a1 is (3,-2,1) and a2 is (1,1,0)

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but idk how to do the [a1 a2] thing

placid zinc Oct 8, 2021, 8:17 AM

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You've done it

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You win

flat remnant Oct 8, 2021, 8:17 AM

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notLikeThis

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A = [3,-2,1 1,1,0] ?

placid zinc Oct 8, 2021, 8:18 AM

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A is
3 1
-2 1
1 0

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Your job was to find a1 and a2, which are the columns

flat remnant Oct 8, 2021, 8:19 AM

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placid zinc A is 3 1 -2 1 1 0

this is what i start with

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my answer should look like A = [a1 a2] and thats what confuses me

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surely i can just do a1 = ... and a2 = ... but thats not what they ask is it

placid zinc Oct 8, 2021, 8:23 AM

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That's not what your answer should look like.

flat remnant Oct 8, 2021, 8:24 AM

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oh?

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what should it look like then

flat remnant Oct 8, 2021, 8:40 AM

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<@&286206848099549185> can anyone help me further please

flat remnant Oct 8, 2021, 9:15 AM

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too late now 😦

surreal radish Oct 8, 2021, 9:35 AM

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hi

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is every square matrix a rectangular matrix

elder glacier Oct 8, 2021, 9:44 AM

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how could I find all the ordered pairs for (x,y) such that 1/x + 1/y = a/b

edgy perch Oct 8, 2021, 10:08 AM

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Hi peeps

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Need help with something

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Is this right? Or do I need to raise 2 to 2 first before proceeding to get the first derivative?

lost gorge Oct 8, 2021, 10:13 AM

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I think your method is perfect

edgy perch Oct 8, 2021, 10:25 AM

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But online derivative calculator shows different answer 🤔🤔

solar adder Oct 8, 2021, 10:31 AM

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DOES ANYONE KNOW TRIG

alpine sable Oct 8, 2021, 10:36 AM

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edgy perch Is this right? Or do I need to raise 2 to 2 first before proceeding to get the f...

its correct

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derivative calculator also shows the same thing

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it actually shows -2sin(x/2)cos(x/2) but - sinx is also right

alpine sable Oct 8, 2021, 10:37 AM

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solar adder DOES ANYONE KNOW TRIG

yeah a bit

solar adder Oct 8, 2021, 10:38 AM

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Screen_Shot_2021-10-08_at_9.38.18_pm.png

alpine sable Oct 8, 2021, 10:40 AM

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drop a perpendicular

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find the length of that perpendicular and then u can find theta ig

vapid oak Oct 8, 2021, 10:48 AM

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I think a better way to approach this would be to use the sine rule

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have you learnt the sine rule?

solar adder Oct 8, 2021, 10:48 AM

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yea its that

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but idk how to do it

fierce frigate Oct 8, 2021, 10:48 AM

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Can someone help?
For the
a) I need someone to check
b-c) I don't know what to do

My a) answer
187.5=½×20×h
187.5 ÷ 20/2 = h
187.5×2/20 = h
H= 18.75

Ratio= 30/20 = 3/2

Height for larger: 3/2 × 18.75 =28.1725

Area ½ × 30 × 28.1175 = 421.875

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Help

alpine sable Oct 8, 2021, 10:51 AM

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hey

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is this channel free

fierce frigate Oct 8, 2021, 10:51 AM

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No that I know

alpine sable Oct 8, 2021, 10:51 AM

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i just want to ask a quick question

fierce frigate Oct 8, 2021, 10:51 AM

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The ratio thing right?

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The bigger over the smaller, since we finding the bigger one

alpine sable Oct 8, 2021, 10:51 AM

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is 0*0=0 or indeterminate?

fierce frigate Oct 8, 2021, 10:52 AM

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Area : ½× base × h
187.5=½×20×h
187.5 ÷ 20/2 = h
187.5×2/20 = h
H= 18.75

Ratio= 30/20 = 3/2

Height for larger: 3/2 × 18.75 =28.1725

Area ½ × 30 × 28.1175 = 421.875

haughty rivet Oct 8, 2021, 10:52 AM

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alpine sable is 0*0=0 or indeterminate?

yes

alpine sable Oct 8, 2021, 10:52 AM

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which is it

solemn bloom Oct 8, 2021, 10:52 AM

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does anybody of ya'll knows how to do this? I don't know how to answer it without cos in the given. It would help a lot.

fierce frigate Oct 8, 2021, 10:52 AM

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That's not the question

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That I know

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Is my answer correct

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Or not

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And the B one is so confusing

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a1 iss area?

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i am so confused

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im looking for aaarea

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btww

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imma try bymyself

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askin pople is confusing

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byeee

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ill ask again

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when

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im ready

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i jusst tipexed it

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daammit

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im confused

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area of eclipse is a x b x pi ?

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is the pi 3.14

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or the full one?

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cambridge wisse

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im usingg normal pi

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so basically my answer is right?

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the b one is confusingg

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after if find the b

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i just ratio it?

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no no no

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dont

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not going on a loop

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do the same thing as a

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right?

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find thee area, and then thee missingg thingg, and then ratio it

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and then find area agaain

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ok and for c?

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i know the area of trapezium is a+b/2 x h

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but i only know one

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huh

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wait wait wait wait

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huh

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a1?

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b1?