#help-42
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<@&286206848099549185>
“Explain why the angles are congruent” why are do they both measure to the same measurements
so like a rectangle has 4 90* angles, because of this if you fold then you create 2 supplementary angles that are therefore congruent
idk
I personally would say that’s a good response
But I’d personally say
“A rectangle has four 90 degree angles so therefore when you create two supplementary angles, it causes the angles to be congruent”
I hope you understand it now 🤔🤷♂️
@clever thorn Has your question been resolved?
yes, thanks a lot
sorry for the late response
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Ive tried looking up examples and looking at info videos for help I just really dont understand this
angle 2 and angle 7 are congruent
so you can set them equal to each other
2x+33=4x-70
I know they have to equal to 180 together
but I dont know how to actually do the math
you mean the algebra?
yea
so you want to have all your variables (the x's) on one side
to do that I will subtract 33 from the left side of the equation
ok ima do this in microsoft paint real quick
actually adding 70 is much more easier
you add 70 to both sides
-70 on the right cancels out
so 103 right
correct
so 2x+103
yes
51.5
but if both sides have to add up to 180 would that make my awnser 128.5?
gimme one sec please
sounds good
hmm this is weird cause 51.5 is the right answer
can the answer even be a decimal
so that's the answer?
if i'm not mistaken then yes
alright apreciate it
yeah np
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Is it possible to add the sin functions to make one sin function and then use that to find the period?
@remote mural Has your question been resolved?
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I'm not sure about how to properly say this in english, but I'm trying to find the implicit derivative of something, and I'm wondering when finding the derivative of sin(x^2y) if thats cos(x^2y)(2x*y') or if you have to use the product rule to find the derivative of the core first
u do chain rule first since it's the outermost part
but after that you need product rule to get (x^2y)'
but using the chain rule, dont I have to use the product rule? Or do I not because its 2 diffrent variables even though they are connected
since neither x^2 or y is constant
Yeah
so then it would be cos(x^2y)(2xy+x^2y')?
yeah
alright thanks
do you know if theres a tool to calculate a long implicit derivation? its so long that Im sure to have some stupid mistakes and would be nice to check if I got it right
I tried some but they gave some really long answers even though I know its supposed to be simpler
for refrence I want to find y''(0) of ln(1+2y)+sin(x^2y)=2
1 sec
not one in particular that I know of
You could graph the graph using desmos
and look at what you think the slope (y') is
and if it matches
Im pretty sure I just have to find an expression for y'' that will contain x y and y' and then put in y(0), y'(0) and x=0 but yeah the problem is that its such a long solution for the y''
ah yeah that makes sense
there's probably some online calculator that can do it
if you haven't searched for one worth a try
I wonder, can I put in values for y and y' as I go? or do I have to get the proper expression for y'' first
I tried a few but didnt really get it to work 😅 but I'll try a bit more
,w second derivative of y^2+xy+x^2 = 0
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alright, thank you for helping 😄
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can you find both a and b in the pythagorean given only c?
apply toa cah soh when appropriate
no angle
impossible right?
unless maybe your given perfect square?
like in a 3,4,5
ok, only given 90 degrees, how would i do it
even then, there are lots of right triangles with hypotenuse length 5
without any other information (are they integers?), you'd at best, have a solution set of possible choices that would end up being part of a circle
then yes, you should be able to do this without any other information.... i think
im thinking
if you are given a perfect square for c, then the a and b must also be perfect squares
??
if everything is an integer, the only solutions would be pythagorean triples.
Given C, you can identify which triple.
nope
3^2 = 1^2 + (2root(2))^2
A Pythagorean triple consists of three positive integers a, b, and c, such that a2 + b2 = c2. Such a triple is commonly written (a, b, c), and a well-known example is (3, 4, 5). If (a, b, c) is a Pythagorean triple, then so is (ka, kb, kc) for any positive integer k. A primitive Pythagorean triple is one in which a, b and c are coprime (that is,...
first section is how to generate a triple
@weak grail Has your question been resolved?
if i need an equation to figure out a and b, given c, what would i write
@weak grail Has your question been resolved?
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Write 2 equations at t=0 and t=3 given the information you have in the question
After that we can find a and k
@quiet folio
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Hi can someone help me to find my mistake here?
Answer should be 13/3, but I’m keep getting. 11/3
g’(x) =1?
you let g(x) = $\sqrt{2x+1}$
duckiescute!
so g’(x) = $\frac{1}{2}(2x+1)^{-\frac12}(2)$
duckiescute!
so you left with (2x+1)^(-1/2) for g’x
Where does last 2 came from?
So, first, different the y=u blah blah blah, the times with u ‘ at the end
*then times
Really appreciate for ur help
no prob!
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Can someone help me to find my mistake here?
Until the 4th line, I’m correct, but when I sub (3, 29/4) in, something wrong with my c value
Pls, I can’t use calculator here
,calc 2/3(9^(3/2))
Result:
18
,calc 29-72+9+18
Result:
-16
Okay
u shld get c=-4
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i have to show for a finite $S\subset\mathbb{Q}$, $\langle S\rangle$ is cyclic. i believe that $\langle\text{GCF}(S)\rangle = \langle S\rangle$. is my intuition correct, and is this that the right approach?
maximo
sure, so long as you define what GCF means for a finite subset of Q
maybe think of whether all your elements can be obtained from 1?
actually this prob devolves into the same argument as yours
@solar spruce Has your question been resolved?
hm maybe i can show it's isomorphic to some subgroup of Z
or just isomorphic to Z at that point
the isomorphism should be something like phi(a) = LCM(denominators of S) * a. i think im back to the same thing with LCMs now instead of GCFs
hm ok i have something going here i think
let $d:\mathbb{Q}\to\mathbb{Z},, d(\frac{p}{q})=|q|$, and $q\overset{def}=\prod_{s\in S}d(s)$. \
now let $\phi:S \to \mathbb{Z},,\phi(s)=qs$. $\phi$ is well defined since we multiply by at least the denominator of every $s\in S$.\
$\phi$ is a bijection, and $\phi(s_1 + s_2) = q(s_1 + s_2) = qs_1 + qs_2 = \phi(s_1) + \phi(s_2)$\
i guess all that's left to do is to show $\phi:\langle S\rangle\to c\mathbb{Z}$ is an isomorphism for some constant c, and we know $c\mathbb{Z}$ is itself cyclic
i think that makes sense, please let me know if it doesn't
maximo
im so bad at using lcms gcds and stuff though. that last part definitely needs some playing around with those to find a suitable c
if it didn't show this is me trying to avoid using lcms and gcds at all costs lmao
@solar spruce Has your question been resolved?
ok so for this to work i need to somehow show $\psi:\langle S\rangle\to\mathbb{Z},,\psi(s)=qs$ is well defined.\
my idea is to let $s' = \frac{1}{q}$, $q$ as defined above. then clearly $\langle S\rangle\le \langle s'\rangle$ since every $s\in S$ is a multiple of $s'$.\
so finally, since $qs'=1,\psi(s) = qs=q(cs')\in\mathbb{Z},\forall s\in\langle S\rangle$\
thus $\psi$ is well defined, a bijection, preserves group operations, and so is an isomorphism
maximo
god what a terrible proof
i don't even know if it works
aaaahhhhhh its not an isomoprhism to Z but to cZ for some c in N
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I would like to ask how tanx derivative is sinx/cosx?
ohNoiAmHere
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i dont understand how to simplify this can you explain as well
Well to start
You can see that 6*5^k and 5^k share common factors so they can be simplified
and then there also the -6 ... +5
yeah, but see that 6*5^k-5^k can be simplified
you can take 5^k out as a factor
to get 5^k (6-1)
where does the -1 come from sorry
so it would come out 5^k(6-1)
5^k*5
w exponential rule
5^k+1
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I dont understand what it means by reflect on y = -1
its like reflecting it across the y axis
but this time, instead of y axis, its the line y=1
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you're creating a new password for your sachool email, your passsword must be 8 letters long. You can use uppercase letter, lowercase letter, or numbers as part of your password. Because you're not very savvy about password security, you decide to include the 4 didgit of your birth year and your 4 favourite alphabets, to be arranged in any order. How many different passwords are possible that dont start with a 0 or end with a 0
my birth year is 2005 and 4 favourite alphabets are H R W S
useful for the question
So you can only use the letters h,r,w,s and numbers 2,0,0, 5 and use each once ?
How many options are there for character 0
it can be 7 things
Yep
Idk what you mean by this
combinations adn permutations?
we are supposed to use that
are you there?
<@&286206848099549185>
I was just having a think I don’t think I can help you W this cause the way I’d go about it is different sorry
its okay no worries
I think I would solve it by first ignoring the condition for start/end with 0. So just count how many ways to arrange the 8 letters and digits. Then, you subtract how many ways there are if 0 is the first digit, and then if 0 is the last digit.
hello again! @manic mist
so to arange 8 letters and digits you could do 8C1 x 7C1 x 6C1 x 5C1 x 4C1...
Yes, or just permutations of 8
Cause xC1 is just x
Idrk you can ask someone else if they write permutations like that, but yes, just 8 x 7 x 6… x 1
Ok I gtg, hopefully you can solve the rest. Sorry 🙁
Nvm I just realized how inefficient my way was
Find someone else, if not, I’ll be back in a few hours and can explain
@limber delta Has your question been resolved?
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What have you tried?
@restive mason Has your question been resolved?
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Idk if this is how I'm supposed to ask for help but yeah I would like some lol
I guess you could use Newton's method to approximate it?
since you're given the possible answer choices, the real thing here is just to plug them in
@sly python Has your question been resolved?
it is a study guide for a test that is not multiple choice so I need to know how to do it, ya know? But I appreceate the suggestion!
you could use the cubic formula, but that's clearly not what they want
your best bet is probably Newton's method, which just locally linearizes the function
I'm unsure what that is but will Google and get back to you, thank you for the assistance
Thanks!
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How would I answer a question like Mr Manku is preparing an acidic solution for his science class. He mixes a 25% acid solution and a 15% acid solution to get 100 mL of 19% acid solution. How much did he mix from each solution?
system of equations
What would the equations look like
the variables are the amounts of each available solution going into the mix, and the equations describe the total volume of the mixture and the volume of acid therein
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Adam invested $10000 into two accounts: one earning 8% interest and one earning 12% interest.
After one year, the 12% investment has earned $480 more than the 8% investment. How much was invested into each account?
How would I do this too
you have two unknowns here
the amounts invested into each account
make a variable for each & convert the problem statement into equations
Can you show me how to do that?
let x be the amount invested at 8% interest and let y be the amount invested at 12% interest, both in dollars
the total amount of money we invested into our two accounts is $10,000 therefore x + y = 10000
this is the variable declaration and one of the two equations
do you understand what has been written thus far?
Yes
do you understand how to write down the other equation?
I don’t know what to do after the first part…
the second sentence of the problem talks about interest
can you give an expression for the interest earned by the 8% account?
also please don't attempt to jump the gun and do more than what i ask you to!
...okay so that's a no to this
have you worked with the concept of interest before?
or perhaps percentages more generally?
Yes
yes to both?
Percentages
okay so if you meant "percentages but not interest" then why not say "I have worked with percentages in general but not with interest"?
anyway, ok
when we say that an account earns 8% interest, we mean that the amount of money in the account increases by 8% every year. that is, the amount by which it increases is equal to 8% of what you put into it.
there is a difference between simple interest and compound interest (namely whether the percentage is calculated from the current total or the initial deposit), but for our purposes it does not matter as the duration is only one year.
do you understand this?
Yes
okay
then let's come back to the question i asked prior
can you give an expression for the interest earned by the 8% account?
No
the interest earned by the 8% account is 8% of the amount invested into the account.
what letter did i use for the amount invested into the 8% account?
X
.8x
no
.08
first off, never write decimals without the leading zero
so it's 0.08, not .08
and 0.8, not .8
Yeah mb
that, unless you want to deliberately set yourself up for losing that decimal point
anyway, let's try this again
what is 8% of the amount invested into this account?
0.08x
0.12y
great
and now
the 12% investment earned $480 more interest than the 8% investment.
can you write this down as an equation?
0.08x+0.12y=480?
no,
that would be "The two investments earned a total of $480 in interest"
which is not what is happening in your problem
So how would I write it down
The interest earned by the 12% account is $480 greater than the interest earned by the 8% account.
Yeah but how would I write down the equation
can you write down "A is 480 greater than B" as an equation?
with the letters A and B obviously
No
A = B+480 no bueno?
0.12y=0.08x+480
great
now you have a system of two equations
x + y = 10000
0.12y = 0.08x + 480
are you able to solve this system of equations for x and y?
I need to solve it by elimination
So would I move x to the other side
0.12–0.08=480
And then solve
Or no
0.12–0.08=480
where'd this come from?
also, no, there are no instructions in the problem to use a specific solution method. you do not "need to" solve this system by elimination.
So how would I solve it
well you could do it by elimination if you really wanted to
I learned substituting and eliminating
substitution can work here too
i would suggest first multiplying both sides of the equation 0.12y = 0.08x + 480 by 25 to get rid of the fractions
i just think you should try something on your own instead of getting me to handhold you through the easy part of the problem
I’ve never done a substitution or elimination problem with an equation that has y and x on different sides
well you can do some algebra to that equation such that the x and y don't appear on different sides anymore if you want
but for the purposes of substitution i don't think that will be super necessary
you do you though
Oh wait, x=10,000-y
And then I do the rest
Right
Nvm that wouldn’t work I think
why do you think it wouldn't work?
it really sounds as if what's stopping you is less lack of algebraic fluency and more extreme hesitation
Wait I did something wrong
Ight now I know what to do I think
Ight I did it
And got x=3600 and y=6400
Thanks a lot for the help
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need help with statement
Just post the question
Determine the truth table of the logical value of the formula H:F1 <->F2 if F1:L(pvq) and F2:Lp(conjunction)Lq
i just dont understand how do u set up the table
with these
Just like you'd set up the table for any other logical value with given formula, just run though cases when p and q are both true and when one of them is true and the other is false and when both of them are false
this is my problem
i dont understand how do u get these
Since the formula is F1 <-> F2, start with determining the values of F1 and F2 in each of the cases
its harder for me to explain it to u
cause from different country
but i just dont get it like why is p true and why is q false
..
etc
We aren't saying that p is true and q is false
We are just considering all of the possible cases
T, T
T, F
F, T
F, F
Yes
pvq means "p or q", if you're having trouble with determining its value then use the table of it
TvT = T
TvF = T
FvT = T
FvF = F
okay
im starting
to get it
i need to ask
what about second collum
how do u get that?
Btw how is L defined?
@remote mural Has your question been resolved?
Ah
So to determine F2, which is the same as Lp ∧ Lq
You first have to invert the values of p and q and then take their conjunction
Negation of T is F and negation of F is T
Ah
Well sometimes you may see t and f first and then f and t I think
But it doesn't really matter
You are free to write tt tf ft and ff, yes
it seems like that
cause there are
different
question where
in second collum or third
t is f
and otherwise
and its confusing to me
on how to get the other collum
The t has been negated
It turned into f because negation of t is f
okay
that is clear
now
what about third collum
sorry for asking
i need to know this cause its kind hard
third collum how are p = f and q = t
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please help
again?
yea im very confused
First, write what you have:
Julian: 10%
Anne: 10%
Richard: 10%
George: 7/25
Timmy: 1/10
Abi: 16
Then you convert George and Timmy into percent.
Timmy - 1
George - ?
George: 7/25 = 28%
Timmy: 1/10 = 10%
ah alr
1/10 = 10% because 1 = 100%
oh yea that makes senes
Now, you add everyone except for Abi.
ty
That means that Abi got the remaining 32%
bet ty again ❤️
So how many percent is one points if Abi's 16 points are 32%?
100
No
68 + 32
Okay
np
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can x<5/3 and x>13/3 be written as XE(13/3,5/3)
just double checkin
but 13/3 is greater than 5/3, so your notation makes no sense
but the spirit is there
thats what im double checkin
hmmm
yeah duh
shoulda just solved 13/3 and 5/3, was just confused xD so the correct form is
XE(5/3,13/3)
yea but that means x>5/3 and x<13/3
oh shoot, then how would I write x<5/3 and x>13/3 in XE(x,y) format?
hmmm lemme think one sec sorry
Well the original problem is to solve the inquality for I 3z - 9 I > 4
and i got "z < 5/3 or z > 13/3"
???
how do YOU solve an inequality?
cause the textbook agrees with "z < 5/3 or z > 13/3" but i was just trying to write it in interval notation
oh, I see the problem
You have z < 5/3 (the first solution) or z> 13/3 (the second solution)
You will have two intervals
(-oo, 5/3) U (13/3 , +oo)
ooooh ok got confused again thinkin 13/3 was the smaller value
it's the fractions that are gettin me mixed up on where i need to be placin em on the number line, but i should type 13/3 into my calc and see 4.33, 5/3 see 1.66, so 13/3 is to the right of 5/3 on the number line
and cause z needs to be smaller than 5/3, or bigger than 13/3, i get why it needs to be (-inf, 5/3)U(13/3,inf) 🙂
thanks!
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ahem
its up top
all?
yah 1 , -4 and9
a=1 b = -4 and c=9 ?
.
you know
what that means
I not asking u for it
I just asking u
if yk
what it means
yeh
nice
right
?
perfect
see you got this
alr so
now
x coordinate
of vertex
is 2
so u know
x is 2
how to find y coordinate
of vertex?
take a guess
ye
alr
,w x^2-4x+9 when x=2
oh my bad
nice
y = 5 :3
ye
nice nice
you got this
so next part
let’s go
hm
alr so
x intercept
what does
it mean
amazing
so
ok let me make it clear
so
usually
are u used to
the eqn
being like
y=
something
yeh
so to find y
u know y=0
,w y=x^2-4x+9 when x=0
tis 9
y intercept
scari numbers 😦
ye so imaginary
that means
eh
no y-intercept
wtf
why ur qn like that
Lmao
nah can’t be
oh wait
nvm
ye
that means no x intercept
am confuzed
so basically
there no intercept right ?
that i
because
u see the i
it goes downnn
oh
OH
yeye
ok ok that makes more sense
ayeeee
nice
so ye
no x int
u can use discriminant
to show that
b^2 -4ac
<0
but the min or mac
the next part
max*
wud be 5 right ?
but
2 is smoller than 5
this is a happy face
hm
it applies to 5 ?
it’s where u draw the y line
so it only applies to y
if its likke -5 id be max right ?
yes
the way it goes up and downs
: (
the left
that’s a maximum
cuz
sad face
has a highest point
it has no
lowest point
so its the highest point
cuz it goes down never ending
hapi face is min sad is max
oh the next one is range...
domain refers to
yes exsctly
X
so range
applies to values
that y
can take
so we found out
that y
ONLY
goes down to
5
ye
that’s the minimum
then rmb for sad face
it goes down never ending
for happy face
it goes up
never ending
to infinity
thats tru
nah
usually
smallest to biggest
also
what brackets
will u use
that’s impt
[)
the regiular paranthesis for the 5 because its not infity right ?
ye
yah...
THE INFITY is the ) and 5 is [
so [5,insert inf symbol)
[ means inclusive of that number
yeye
so just know that
if ure dealing
with inf or -inf
it will never
be []
for the inf
oh ok
bye bye thank u so much
nah
glad to help
bai baiii
,w -4x^2-8x-5 when x=0
,w y=-4x^2-8x-5 when y=0
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i dont get the wording
well the halftime is 1600 years

