#help-28
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Can you help me with my exercises from 1 to 8.
where exactly are you stuck?
Exercise 1, basically factorize and you'll get your answer
in such a way that you don't get denominator 0 when you plug the value of x
@nimble bear Has your question been resolved?
Can you do exercise 1 to 3 for me?
Because I didn’t attend the lesson.
So I don’t understand anything about it.
what is it that you don't understand 😅
do u know limits, functions?
Cause they can't teach whole thing in one lesson 😭
I had some problems last year 😭
Oh i'm sorry!
But i think it's important for you to understand them more than me solving them.
Yeah but it’s due tomorrow, so I can’t really under the whole lesson in a couple of hours.
That’s why I’m asking someone to solve it for me.
well
Look at the first question of exercise 1
what do u understand from it?
also i don't understand what the question above it says 😅
the french one
It basically says to study the continuity of the function f(x) in x0.
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.reopen
✅
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do you know the steps for solving an equation like this?
In other words do you also know how to find critical points
just vertex form of a quadratic
vertex?
ye
got it got it
how bout this
is it simultaneous
the equ of the curve with y=3/2
nvm i got it
how do i show <@&286206848099549185>
send the q 1st, wheres figure
what does "Find 2fg(x) = 3" mean ? solve it ? is fg the 2 functions compounded ?
if yes to both, then fg(x) = x
so 2fg(x) = 2x = 3
and then you have to conclude that x = 3/2
@lavish tapir Has your question been resolved?
9 is the diametric form
(x-x1)(x-x2) + (y-y2)(y-y1)
put x1,y1 and x2,y2 as given points
show that f^-1(x) = sqrt(x+4)+1 (it's g(x))
then you're looking for the intersection with the graph of f so when x is the solution of f(x) = f^-1(x) ie f(x) = g(x)
however, I would guess that the previous questions are here to help you for this one
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got it
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dont know
@torn jolt Has your question been resolved?
<@&286206848099549185>
bro stfu
great way to get ban
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hello, I've been trying to solve the problem right here, I have the solution, but idk what is the process to solve it like it's described here. Can someone explain me how did I get to the second part explained here?
They've written sqrt(x + 2) - sqrt(x - 2) as a fraction with denominator 1 and multiplied by the conjugate, same for the numerator
So $\frac{\sqrt{x + 2} - \sqrt{x - 2}}{1} \cdot \frac{\sqrt{x + 2} + \sqrt{x - 2}}{\sqrt{x + 2} + \sqrt{x - 2}}$
Jelle
ok, but where does the 8/4 comes from
Try what happens if you multiply this out
isnt it (a-b)^2?
No it's (a + b)(a - b) = a^2 - b^2
It would end in something like (x+2-x-2)/sqrt(x+2) + sqrt(x-2)? after multiplying both numerators?
that's what I got
idk if not
It should be ((x + 2) - (x - 2)), where the (x - 2) is between brackets
That way it cancels out to 4
yeah I got 4 on the numerator after that, but after what do I do
You do the same with sqrt(x + 4) - sqrt(x - 4)
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For the first part you need to check the domain
It’s only between -4 and 4
So the graph that u chose is x^2-9 however the x values got beyond 4 and -4
So what other graph goes through (3,0) (-3,0) and (0,-9)?
Not quite
-9 is correct for the lower value
What is the maximum value |x| can take?
4
Yep
So then u substitute 4 into the equation
x^2 -9
To get the maximum y value which is the upper value to the range
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Hello can someone help me with this?
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hi

I was wondering if anyone could explain this derivative to me. I was under the impression that if f was decreasing, the derivative y value would be under the x axis
i was tryna claim it really fast
f is in red, and f' is in blue. I was wondering why the left part of f' wouldnt be going downward, becasue f is decreasing in the middle tehre.
Nvm, i got the derivative wrong.
.close
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yo
this is fast question
i just want someone how my professer got from this step to the other
questions plus answer
how did he get to this part
the x ^ 1+b-1
<@&286206848099549185>
@earnest fulcrum Has your question been resolved?
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is it considered "bad practice" to visualize dx as the width of each interval (the size of n)?
or is this exactly what dx means
dx is literally delta x, the difference in x
LOL
alright
I thought it was the entirety
from 0 to pi in this case
and dy would be 1
if your interval was that large the difference in y from 0 to pi is 0, since y value is 0 on both ends of that interval
i know 3b1b is popular and all, but its "quick," and doesn't really provide the insight behind integrals. you should pick up a calc book if you haven't already. my book introduces the riemann sum first, which is key to understanding what exactly you're doing with integration.
oh right, the y value starts at 0, goes to 1, ends at 0
so dx is referring to an infinite sum
and this is always the case for dx?
oops, bad wording
lemme rephrase that
dx is referring to the change in x value, to infinitely many rectangles?
rather than the sum itself
the S symbol would do that operation
in essence, yes. dx refers to the size of the rectangles, or interval.
not to be confused with the interval of integration
so in the case of sin, for dy, the upper limit is 0, and the lower limit is 0. (b-a)
(0-0) = 0
if the size of your dx was pi
i don't know if I have heard this term before, "interval of integration"
the interval of integration is [a, b]
this is the meat of it, which is hard to grasp from just 3b1b videos
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Not sure how to approach (c)
What step are you on?
1. I don't know where to begin
2. I have begun but got stuck midway
3. I got an answer but I'm told it's wrong
4. I got an answer and would like my work checked
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6. None of the above
Do you have any work or ideas?
i tried letting z=x+iy
Ok, good start
Show your work, you made a mistake
Okie doke
@west field Has your question been resolved?
Assuming that's correct, $xy=0$ implies that $x=0$ and/or $y=0$
Civil Service Pigeon
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the triangle on the left is a right triangle, so you could use pythagoras
(with hypothenuse = 9 and base = a = 9sqrt(3)/2)
didn't I answer this earlier
p sure u showed me like x/9 or something and i didnt understand lol
b^2 = 9^2 - 9sqrt(3)/2^2?
b^2 = 81 - 81(3)/4
b^2 = 81 - 243/4
this feels very wrong
i dont think im doing it right
keep simplifying
im not entirely sure how to simplify 243/4
unless its like
b^2 = 81 - 60(3/4)
b^2 = 21(1/4)
b = sqrt(4(1/4))
oh yah
i forgot u can turn random numbers into fractions like that
how do u square root 81/4 tho when b^2 = 81/4
nvm
should be 9/2 no?
or 4 1/2 depending on how u wanna simplify it
9/2 yes
then to find g it would be
sin 60° = 9/2/g right?
or
sqrt(3)/2 = 9/2/g i think
yep alrighty ty
that helps a lot
.close
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but when I remove it
i get ma=0
lol
im lost
<@&286206848099549185>
<@&286206848099549185>
lol
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thats the bot usually do
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@torn jolt Has your question been resolved?
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Is that right?
-8?
yep
.close
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i need help solving this problem
x is 16cos(30)
and y is 16sin(30)
cos(30) is sqrt(3)/2
so ur value for x shld be positive not negative
as both sin and cos are positive in the first quadrant
How did you solve it?
draw cartesian equation
and line with length 16
and angle of 30
and use trig to solve x and y
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A street light is mounted at the top of a 15-ft-tall pole. A man 6 feet tall walks away from the pole with a speed of 4 ft/s along a straight path. How fast (in ft/s) is the tip of his shadow moving when he is 30 feet from the pole?
I’m not sure how to draw the shadow
They didn’t go over any problems like this in the lectures
Draw a hypotenuse along the man
Basically just extend the hypotenuse and the horizontal
im lost
Just draw a horizontal line from the man's leg such that it touches the hypotenuse you extended
@woeful grove Has your question been resolved?
@woeful grove Has your question been resolved?
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Say I had the function f(x)=1/x where the domain is R-{0} it's a continuous function, right?
yes
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how do i do question 4
maybe express them all in the form of coordinates
prove LHS = tanA
i got (tanA - 2)/(2tanA - 1)
which is equal to tanA but i dont know how to end it there
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<@&286206848099549185> can you suggest how can i write the green's function for Cylindrical and Cartesian coordinate for laplace's equation
I think that Microsoft word office 2019 and the previous versions in math editor provides the necessary tools
Hi Gorge! I didn't understand what you are saying . It will be very helpful if you kindly explain it a bit .
You open a new word file you go to insert option in ribbon menu and you choose insert function. And then it opens the math editor. See the options is has....
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Can someone explain this in steps, the topic is simplifying radicals. I'm confused about the b.
when you multiply the radicals the terms inside the radicals get multiplied under the radical right
so
that would be
√50x^2
or
√2•25•x^2
Yeah
I got that part too
but how do you have the result from that?
ohh shit
I realised
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hi, i need to figure this one (I'm not a native english speaker)
how do I solve 22/(3+sqrt(17))
my calculator says its around 3.08854
a friend told me its 22/8=2.75
and an online calculator says its 34/7=4.857
what part of the image should be clearer? my writing is not that good if thats the problem
your friend is clearly wrong
should the picture be bigger?
why'd you cancel the three there
1st one is correct
22/ 3+ sqrt17
22/(3+4.23)
22/7.23 which is approx 3
so wrong
whats wrong there
eqn is 22/ 3+sqrt17 right?
Whatever you did here is wrong
yes fixed it
then how did you got this eqn
wdym?
I need to solve it without calculator btw which is why I need to get it without it
Also $3^2 - 17 \neq 14$
dldh06
right
oml how did i get to -14 lmfao
its 8
but I need to sort a few fractions by size and personally I cant see rn if its bigger than 22/7 and 21/7 or smaller
Can you send the original problem?
Then honestly, you may have created more work than needed
So 22/7 = 3 + 1/7
22/(3 + sqrt(17)) -> sqrt(17) is close to sqrt(16) = 4 but there's a little extra so 4....., so 22/(3 + 4......) or 22/7....... and because the denominator is just a little bigger than 22/7, that means 22/(3 + sqrt(17)) is smaller than 22/7
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can anyone help?
You must be a bot manager to use this command!
!status
What step are you on?
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@torn jolt i dont know where to begin
@clever meteor Has your question been resolved?
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16x+16y+16z=xyz solve this in integers
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can someone help me understand why this is the answer?
You can plug in values for x
Like what happens if you do x = 3?
becomes 9
And which graph has (3, 9) as a coord?
i was trying to get the y=mx+b
For graphing quadratic equations (lets just look at the one on the left) each element transforms the graph. A stretches the graph, b shifts the graph left or right and c shifts the graph up and down
You can't because it's not even a line
oh it only works for straight ones?
ok i get u
Not really helpful because the opening sideways parabola is x = y^2
so just leave it like that
Yes
You can do what you did before, plug in values for x
so x = ..., -2, -1, 0, 1, 2... if it's multiple choice
You mean +x^2?
yeah if it was 1 + x^2 the parabola would be smiling
Yes
okayy i get it, i appreciate u
I was clarifying because you left out the ^2 part
.close
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@covert light Has your question been resolved?
take the derivative
derivative = negative -> decreasing
and vice versa
find where derivative = 0 thats where the derivative changes from - to + or from + to -
take the second derivative
if secodn derivative at that 0 point is positive, its a minima ( not technically) or the derivative is increasing, menaing it went from negative to positive
meaning at the point where the derivative = 0, at that c value, on the left side (less than) the graph had a negative gradient and was decreasing
vice versa for the right side
if the second derivative is negative its a maxima, so the opposite
so gradient goes from positive to negative
or increasing to decreasing
anyway have fun
@covert light
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simple interest, not compound interest
youve computed compound interest
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i need help finding angle x and angle y
@dusky lily Has your question been resolved?
try finding these 2 angles and then make an equation. Then do simultaneous
@dusky lily
Oh
The
One
The angle
In the corner
Next to 63
Degrees
=7x-31
Alternate angles
Then
Using inner angles sum to out side exterior angle.
To find x and solve y
The angle above 5x-8 would be 4y+27 by corresponding angles right?
Which means one of our equation is 5x-8+4y+27=180
Then as you rightly pointed out, the other angle is 7x-31. Which means 7x-31+63+5x-8=180
So now you just have to simultaneous
@dusky lily
Yes
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What did i do wrong
when you evaluated the x integral , should be (45-27/2)-(0), if you pull out 3/2 then the integrand is 30-9=21
you evaluated the limits in reverse and factored incorrectly
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i am finding this question a bit trickey, could some one help me please?
work backwards from what you were doing before
i tried that but i confused my self lol
@formal scarab did i do it right?
yeah
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little conceptual question about linear combinations
what is r here? is this assuming that the size of V = size of F? is it the size of the smaller set?
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so is it just guess and check
evaluate the following limits.
?
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Hello, if there are 2 gamepad buttons X and Y and you can combo it to 4 inputs 1 example would be X + Y + X + Y
How many 4 button combos are there without repetition?
Without repetition?
other examples would be
X + X + Y + Y
Y + Y + X + X
how many 4 button combos would there be?
I don't think I understand without repetition, just like in a video game combo
@spice orchid Can I please get some help in my channel after you're done with Judi?
is that the original question?
Don't ping me an interrupt someone else's channel that's rude
let's say your character can combo attacks 4 times with the buttons X and Y how many 4 button combos are there?
You have 2 options for each button press
My apologies.
And you have 4 button presses
how do I figure out how many combos are there?
If it was only 1 long combos how many would there be
something like this:
X + X + X + X
Y + Y + Y + Y
X + X + Y + Y
Y + Y + X + X
X + Y + X + Y
these are 5 combos that pop up in my head, how many are there without having to manually trial and error them?
If the combos were only one button long, how many would there be
I don't quite understand this question, 1 button long you mean to say I only get to use 1 button? If it is 1 button (say Y) and 4 inputs then there will only be 1 combo of 4 buttons
Y + Y + Y + Y
I am saying rather than these being 4 buttons long, they are only 1 button long, how many options will you have
We're starting easy so you spot the pattern
Your combos no longer require you to press 4 buttons, just 1 button, what are your options
oh I see, if there is only 1 input required then the combos will be 2 they are X and Y buttons
yes input cause in programming when it's asking for info you press a key that's an input
2 inputs:
X + X
X + Y
Y + X
Y + Y
so there are 4 combos
Great, notice how to get those we just take all the old 1 input combos and add either an X or a Y to the end
Do you think you can work out how many 3 input combos there are without listing them all?
Using this fact
Oh yeah now that you've mentioned it it's just adding X and Y at the end
8 combos for 3 inputs?
16 combos for 4 inputs?
I see thanks!
2 since there are 2 buttons? and raise to n the amount of inputs?
Thank you so much @spice orchid
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You too
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derivative of a constnat is 0, so u get 0 = (product rule)
but it does not work when i do that
Show your work, and if possible, explain where you are stuck.
putting dtheta/dr to one side and dividing etc wont get me the answer
so idk what im doing wrong
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I don’t understand how to solve this
What do you mean solve ? You just wrote down log(1/1000)=-3 which is a true statement. Or are you asking how to get to the solution when given log(1/1000) ?
Oh yeah sorry i have to write it in exponential
Im not sure exactly what to do with this because of the fraction
Are you working on a specific problem right now ?
Well the problem is just the picture and the instructions say to write the logarithmic equation in exponential form
Huh.... i am not sure what they want. my GUESS would be that you have to convert the fraction inside the logarithm into an Exponent because the authors want to emphasize how the logarithm works.
Since log is kind of the inverse of exponentiation
Does this look familiar ? $a^{-n}=\frac{1}{a^n}$
ImToxiiq
No it does not
Hm, then i am really Not Sure what your task is asking you to do. The definition above means that 1/1000=10^(-3) and from there one can apply Log Rules to Show that the equality holds
I can give u an example it gives to me if that may be helpful
Oh Looks Like this ist what i told you here
Basically the topic is Power and logarithmic rules
I was just taught this today so im am not to familiar with the rules
No worries. The three important Things to notice Here are: 1/1000=1/(10x10x10)=1/(10^3)=10^(-3), Log(a^n)=n * Log(a) and Log(10)=1 Note: Log is the logarithm Base 10 Here
Those equalities are both true yes. Now Just Plug in 10^(-3) into the log
Oh
Mb
I misunderstood what the question asked
Yeah, this solution should be correct
:)
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How do I find the domain of a composite function
I can’t wrap my head around it
Do you know what f(g(x)) means?
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Good! You're now solving a linear equation
Every term with a dy/dx on one side, everything else on the other
Yes. You should.
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I have doubt in both d and e bit of 4th question
<@&286206848099549185>
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<@&286206848099549185>
Please only use the <@&286206848099549185> ping once if your question has not been answered for 15 minutes. Please do not ping or DM individual users about your question.
SHUT UP
Why the hostility?
What is? You pinged helpers early and was told you needed to wait 15 minutes and then you pinged again without waiting, I don't see anything annoying about getting told to follow the rules
What's the doubt?
The d bit
And e bit
But first the d bit
I don't understand how to use identities bro zthey have no square there
Have you tried anything?
What about finding a common denominator and adding the two fractions?
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what am I doing wrong
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quotient rule for derivative
i’m pretty confident until the last step
did i simplify right ?
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“In(x-4) = In2” since there is no base in either side would it be automatically 10 for both bases?
$\ln$ is reserved for log base e
riemann
Does e have a value?
Result:
2.718281828459
@pliant quarry Has your question been resolved?
the base doesn't matter for this problem regardless
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I have talked my Algebra II teacher's ear off about theoretical questions (I don't expect any other sophomores to have asked her these types of questions before) and one in particular has stumped me. I'm not sure how to properly format or describe my question, but I will ask it to the best of my ability.
This question stands for any two transcendental numbers, but for example, we'll take Pi and e. Let's say you have an infinitely long sequence of digits from e, can this sequence be found inside of Pi? They both stretch to infinity...
- How would you represent on paper the length of the largest sequence of numbers found both in Pi and e?
- Another problem with this question is that it'd mean that this infinitely long sequence of e is in some way smaller than another infinitely long sequence of Pi... Can two different instances of infinity somehow be different in size?
Maybe I'm overthinking it or incorrectly assuming that you can find this sequence in Pi.
well this would basically mean that pi and e "end" the same way
they are both of the form rational number + same "end"
this could be, I dont think we know. it would of course be very surprising
it's an interesting thought, though
I think we don’t know because we don’t know if pi - e is transcendental or not
infinite monkey theorem says yes to ur first question
no
That works for finite sequences
and we dont know if e and pi are normal numbers
I see that logic but also ask how you'd represent the limit of how many digits you can find inside of it. Is there a limit? They're both infinitely long...
everything that involves a digit representation is always a bit awkward to write down as a formula
while it's true that every finite sequence is somewhere within pi's decimals, that's not necesarrily true for infinite sequences
No it’s saying an infinite random sequence contains any finite sequence
(almost surely)
ohh
ok that makes sense
Are we even sure that the digits of pi are random
no
Sounds like all we can really do is grasp at straws and say nothing about the truthfulness of your statement
Even if it wasn't random, we do know that each digit will appear around the same amount of times as any other
Do we?
no

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how does this one work
so 2n +1, n is an element in N and 50 is less than or equal to n, and n is less than 100
i don't get it
sorry f
for the late reply
uh
so he asked us to make it so the numbers would be uneven
so
1
3
5
and so on
and this is one of the possibilities
i just don't understand everything in it
mainly the "n" part
every 2n+1 is an element of this set where that n is a natural number between 50 and 100, n is not 100
why does the n part confuse you?
2n+1 is the element of that set, but the " n is a natural number between 50 and 100, n is not 100 " is a way to tell you all the values that n can have
list the n that follows this criteria "n is a natural number between 50 and 100, n is not 100"
so what happens after u find out what n is?
lets say n is 51
what would happen then?
n = 50, 51, 52, 53, 54, 55, ... 99
then you plug the values of 'n" into 2n+1
would it be 2 times 51 + 1?
that would be your element
corresponding to n= 51
ues this next
let me try it first
okay so
x is an element of Z
100 is smaller than x and x is bigger than 200 which means its between 100-200
and x/2 will not be a part of Z
so this would mean that oneven numbers are the only possibilities here
100/2 would make it not part of 2 but 101/2 would
is that right?
yes you are right
you are welcome:)
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Square root of 10 = 10^1/2
you dont have to put the 3 back in
yeah you really don't need to bring the 1/2 and the 3 inside the logs
$\log_{10}(10) =?$
rafilou2003
oh
that’s just what our teacher told us to do
That’s what I put into the calculator and got the answer i don’t know if there’s a easier way
you can use any method you want
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I don't even know how to start to prove this
@open matrix Has your question been resolved?
You can just multiply CD and DC and they're both the identity matrix
Hdym? Sorry 😅
You mean like just multiplying the eq for C and the eq for D?
Haven't tried that but it's a proof question tho
@open matrix Has your question been resolved?
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If I have (1/2)/(sqrt(3)/2)) how could I convert that into a singular fraction? If possible, could someone use the bot's cool image thing to show me how?
$\frac{\left(\frac{1}{2}\right)}{\left(\frac{\sqrt{3}}{2}\right)}$?
B-eard
Yes, but how could I turn that into one fraction?
Flip the bottom fraction
Multiply instead of divide
Think of it as $\frac{1}{2} : \frac{\sqrt{3}}{2}$
USS-Enterprise
"keep, change, flip". Keep the first fraction, change division to multiplication and flip the second fraction
$\frac{1}{2} \cdot \frac{2}{\sqrt{3}}$
USS-Enterprise
$\frac{1 \cdot 2}{2 \cdot \sqrt{3}}$
USS-Enterprise
Or just, middle ones go to the denominator and the outer ones go to the numerator
I got 2/2sqrt(3)
USS-Enterprise
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The exercise is : Find the volume common to two spheres, each with radius r, if the center of each sphere lies on the surface of the other sphere
I found the formula for half of the width of the object as a function of y :
it is the purple formula
If I rotate the purple curve from y=sqrt(3)r/2 to y=-sqrt(3)r/2 around the y-axis I shall get the desired object
So I integrate with respect to y the purple formula squared times pi (the disc method)
But I get that
which is different from the answer
What is wrong with my reasoning ?
@torn jolt Has your question been resolved?
@torn jolt Has your question been resolved?
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I get that there would be 64 in total
But I don't get the part where it says touching the box
like if the sides of the box were covered in red paint
how many of the cubes would have red on them when you take them out
How would I find that out 😭
You need to take into account the boxes which touches the bottom as well
maybe draw a quick sketch
Yeah that'll help
like this but with more lines
So would the base have 16 cubes touching it?
yep
So I have the base 16 cubes
And then every other layer 12 cubes would touch the sidess
And there should be 3 more layers?
16+12+12+12=52
Is that right?
yeah good breakdown
Ookay is there a more efficient way to do this porblem tho?
i'd say not really
i mean you can start with 64 and identify 12 of them that aren't touching the sides
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really dumb question honestly but idk if theres some right answer i cant see
"theres a group of 100, consiting of teachers and at least 1 student. you pick 2 people from the group and can by certainty know that 1 of the people is a teacher. how many teachers is it in the group?"
must be 99 teachers and 1 student or what
like gut feeling says 51 teachers but that doesnt make it completely certain
if it was a group of 3 then 2 teachers and 1 student 🤨
Hello
If you pick 2 of 100 it's 100% that you oicked from both types its 99-1
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How do I evaluate the limit: Lim as x-> infinity of [(x^1000 )/ (1.01^x). I know that as i continue to derive x^1000 it will become smaller and therefore the denominator will dominate. However, how do i prove this?
my work:
Because only powers matter. x>1000
would there be a way to show this
Intuitively you could see this problem as a "bottom heavy" or "top heavy" but as we know since the exponent decides the outcome. This becomes "bottom heavy" since infinity to the power of 1000 is finite relative to 1.01 to the power of infinity. As far as proofs go idk
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How is this not right?

