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The Unofficial Homework Help Thread

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LoathesRaisins
Posts: 3612 - Karma: 4,735
If you need help with any of your homework post it here. Maybe someone here can help you with it.
Sep 17 2012 10:10PM
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chicken
Posts: 6843 - Karma: 2,122
is anyone familiar with this type of question? I have no idea how to answer this in any systematic kind of way...

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Nov 25 2012 8:29PM
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Chinchi
Posts: 1591 - Karma: 4,210
So I have to write a poem/short story in the style of Edgar Allan Poe, if anyone has done this and has any ideas or possibly an attempt of their own they would let me use, it would be greatly appreciated. Also if there is infact someones I can borrow, I will sweeten the deal no doubt. Thanks guys!
Nov 25 2012 9:27PM
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chicken
Posts: 6843 - Karma: 2,122
do these look like the most simple solutions? also fixed broken link...

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Q0:
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Q1:
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I am so new to this whole logic thing haha.
Nov 26 2012 3:26AM
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Chinchi
Posts: 1591 - Karma: 4,210
Yeah I'm desperate as fuck now if someone has composed a poem similar to the raven or Annabel lee or a short story like the black cat pm me
Nov 26 2012 9:12PM
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LoathesRaisins
Posts: 3612 - Karma: 4,735
Due tomorrow?
Nov 28 2012 1:13AM
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LoathesRaisins
Posts: 3612 - Karma: 4,735
Not quite sure how to write this.
Write the expression in simplest form : (81/4)^1/6
Dec 3 2012 11:51PM
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Chinchi
Posts: 1591 - Karma: 4,210
Haha last Wednesday, anyways I ended up pulling the all nighter and getting it done the old fashioned way
Dec 3 2012 11:54PM
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Brentizzle
Posts: 1584 - Karma: 1,871
A manufacturing firms production function is Q= KL+K+L. For this production function, MPL= K+1 and MPK = L+1. Suppose that the price r of capital services is equal to 1, and let w denote the price of the labour services. If the firm is required to produce 5 units of output, for what values of w would a cost-minimizing firm use...

a) only labour?
b) only capital?
c) both capital and labour?

I have been working on this question for the last few days with other people and its just messing with our minds. Could an Econ major please help us!!!

so far I have gotten 5/36 for a and 36/5 for b which I dont think is right.

any help would be much appreciated. I might scan another question and toss it up here if anybody can actually help with this.

THANKS!!!
Dec 4 2012 12:34AM
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ECAK
Posts: 150 - Karma: 50
NS I need your help. I have to write a childrens story. Anyone who has written one in the past and has their story it would be awesome if they could send it to me. Needs to have a moral and a main character. Please help! thanks
Dec 4 2012 12:43AM
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Darth.Maul
Posts: 2472 - Karma: 652
I wrote a kid story once in 3rd grade. i'll upload it tomorrow
Dec 4 2012 1:34AM
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chicken
Posts: 6843 - Karma: 2,122
ok this might sound stupid, but does anyone know how to prove that the cauchy-schwartz inequality,in euclidean space, is an equality if and only if the vectors are linearly dependant?
Jan 7 2013 10:40PM
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Big_C
Posts: 243 - Karma: -9
not me   try to google and read a few articles, im sure one of them will mention something useful
Jan 7 2013 11:31PM
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chicken
Posts: 6843 - Karma: 2,122
yeah i've tried. I even watched the video on khan academy. thought someone might have this part of the proof in their book!
Jan 8 2013 12:39AM
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Puns
Posts: 2052 - Karma: 429
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duhhhh

I don't know if this is right I was curious what that was so I googled it
Jan 8 2013 12:45AM
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chicken
Posts: 6843 - Karma: 2,122
that's just the inequality. which I know how to prove a few ways. I am struggling to understand how to prove that it is an equal only when the vectors are linearly dependant.

thanks for the help though!
Jan 8 2013 1:28AM
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Uah
Posts: 1104 - Karma: 176
The easiest question on this assignment is turning out to be the hardest.

These are visual displays of articulatory phonetics, but I have to write the scientific\specific name they are referred to as. Please Newschoolers, you are my only hope.

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Again what are these diagrams referred to as?

Please Newschoolers you are my only hope.
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Jan 14 2013 5:54PM
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.MASSHOLE.
Posts: 7408 - Karma: 11,040
Two quick problems. Just want to make sure I am right for the first

Consider the following system of linear equations : P=a-bq and p=c+dq. Assume that a>c>0 and that d>0, b>0. Solve for the values of p and q in terms of the parameters a, b, c, d that represent the intersection of these two lines. Note that a, b, c,d are simply positive constants

and

Suppose x^(1/4)y^(3/4)-j=0 where J is a positive constraint. Solve for dy/dx
Jan 16 2013 6:56PM
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chicken
Posts: 6843 - Karma: 2,122
huge karma if you can explain to me what this is asking me to show...

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Feb 10 2013 6:31PM
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chicken
Posts: 6843 - Karma: 2,122
oops the very first line should be:

x^2\sin{\left(\frac{1}{x}\right)}+\frac{x}{2} & \text{if } x \neq 0

the x/2 is added, not multiplied.
Feb 10 2013 6:34PM
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Brentizzle
Posts: 1584 - Karma: 1,871
damn i was just in calc last semester and we did tons of these but I totally forget everything from that pretty much. wish I could remember this and help. Could probably pull it up in my notes if you dont get it soon.
Feb 10 2013 9:57PM
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chicken
Posts: 6843 - Karma: 2,122
thanks. I figured it out though.

This class makes me miss multivariable calculus so much.
Feb 10 2013 11:21PM
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chicken
Posts: 6843 - Karma: 2,122
damn another one. I promise NS is my last resort!

Derive the following version of the product rule for partial derivatives:

\partial^{\alpha}(fg)=\sum_{\beta+\gamma=\alpha}\left(\frac{\alpha !}{\beta ! \gamma !}\right)\partial^{\beta}f\partial^{\gamma}g
Feb 11 2013 5:13PM
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chicken
Posts: 6843 - Karma: 2,122
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Feb 11 2013 5:15PM
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act.resist
Posts: 8875 - Karma: 513
What do you need help with, I was in an AP Spanish class in high school. I don't know if I can still recall any of it though
Feb 11 2013 5:20PM
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act.resist
Posts: 8875 - Karma: 513
Oh lol I didn't see the date
Feb 11 2013 5:21PM
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chicken
Posts: 6843 - Karma: 2,122
+k for trying to help anyways!

NS is full of smart people. Saved me a few times before when physics forums or openstudy failed to deliver!

I know there must be math majors on here. Take a look at my problem above!
Feb 11 2013 6:41PM
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DeRizzo
Posts: 3827 - Karma: 3,483
say whaaaaaaaat?
Feb 11 2013 6:49PM
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chicken
Posts: 6843 - Karma: 2,122
pretty much what I said. but yeah, it's the product rule and I can see that now. still no idea how to derive the damn thing.
Feb 11 2013 7:10PM
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cool_name
Posts: 4295 - Karma: 3,131
how do i solve 3^(x+2) + 3^(x+1)=108

i am really stuck, because b^x +b^y cannot be simplified
Feb 11 2013 7:23PM
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Mag
Posts: 8155 - Karma: 14,809

Solve for x: 3^(x+1)+3^(x+2) = 108 Simplify 3^(x+1)+3^(x+2) = 108 by making a substitution. Simplify and substitute y = 3^x: 3^(x+1)+3^(x+2) = 12×3^x = 12 y = 108: 12 y = 108 Solve for y. Divide both sides by 12: y = 9 Perform back substitution on y = 9. Substitute back for y = 3^x: 3^x = 9 Eliminate the exponential from the left hand side. Take the logarithm base 3 of both sides: Answer: | | x = (2 i n pi)/(log(3))+2 for n element Z
Feb 11 2013 7:36PM
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cool_name
Posts: 4295 - Karma: 3,131
ya i am going to guess my teacher made a typo then because we never did anything like that in class, but thank you so much anyway.

and for the shaksphere question sparksnotes is your best friend they usually have a short video explaining the plot
Feb 11 2013 7:58PM
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chicken
Posts: 6843 - Karma: 2,122
it's probably not a typo. your teacher probably wants you to just find the integer solution which is x=2. This is how I would do it (with a bunch of extra steps for clarity)

3^{x+2}+3^{x+1}=108
3^23^x+3^13^x=108
3^x(9+3)=108
3^x=\frac{108}{12}
\log_3\left(3^x\right)=\log_3(9)
x=\log_3\left(3^2\right)
x=2
Feb 11 2013 8:29PM
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chicken
Posts: 6843 - Karma: 2,122
that's in LaTeX.

this might work to make it more clear:

http://mathim.com/q/#3^{x+2}+3^{x+1}=108\\%0A3^23^x+3^13^x=108\\%0A3^x%289+3%29=108\\%0A3^x=\frac{108}{12}\\%0A\log_3\left%283^x\right%29=\log_3%289%29\\%0Ax=\log_3\left%283^2\right%29\\%0Ax=2
Feb 11 2013 8:34PM
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DrZoidberg
Posts: 5675 - Karma: 4,268
Good luck with that product rule thing.

I was about to ask about some t test related but just I realized that I have 11 data so 10 degrees of freedom and my book lists that t value at 95%. Usually I never have the value I need cause I collect data in strange numbers, and I have to search around for the t value.
Feb 11 2013 8:50PM
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cool_name
Posts: 4295 - Karma: 3,131
fuck ya, i get it now, thank you

i never realised you were allowed to spread the exponents like that but it makes sense
Feb 11 2013 10:21PM
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Plankton
Posts: 3226 - Karma: 6,840
Who was the preceding dictator to lenin in russia? Stalin im thinking?
Feb 11 2013 10:43PM
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chicken
Posts: 6843 - Karma: 2,122
uh I thought lenin was the first guy. So it would be the last tsar right? I wanna say alexander?

either way you should be able to wikipedia that shit.
Feb 11 2013 10:53PM
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chicken
Posts: 6843 - Karma: 2,122
no worries. and yeah exponents and logs are very cool. Theymight seem boring at first and so does trig, but once you learn them both and about complex numbers then they lead to a very interesting mathematical relationship called euler's formula.

that's the reason the first solution that was posted here looked so crazy but you can just ignore that for now.
Feb 11 2013 11:13PM
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Plankton
Posts: 3226 - Karma: 6,840
alexander iii lenin and trotsky overthrew if i remember correctly
Feb 11 2013 11:39PM
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kstanz
Posts: 3058 - Karma: 477
Anyone really good, better then grade 12 level at editing and checking for grammar issues please PM me! Looking for someone to edit an opening for a scholarship essay

Also the integration formula for a question like this: { 10^x dx or { 5^7x dx
Mar 9 2013 10:56PM
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O-A_s
Posts: 373 - Karma: 58
If I remember correctly you change 10^x to e^x(ln10) and then integrate.
Mar 10 2013 3:34AM
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appa
Posts: 2249 - Karma: 1,739
damn you guys are on another level.


anyone able to give me as quick a summary can be given on line integrals, curl, and surface integrals, i would be in your debt. alas, i have fallen far behind these past weeks.
Mar 10 2013 3:43AM
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Arabian
Posts: 667 - Karma: 880
Line integrals are the sum of integrals over a piecewise integrable function on the set of Real numbers in counterclockwise motion using the Fundamental Theorem of Calculus v2. Curl is simply the cross product of the gradient vector (an n-dimensional vector composed of partial derivatives of their corresponding unit vectors, and surface integrals are the double integral of a vector-valued function multiplied by the square root of the partials of the x and y component values squared plus on. I can be more verbose if you like, Garret. Don't be a stranger.
Mar 10 2013 4:56AM
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Arabian
Posts: 667 - Karma: 880
When the vectors are linearly dependent, the vectors given are multiples of each other, and, therefore, have no angle between them such that the their dot products are considered simple products between numbers, rather than A . B = ABcos\Theta, as in the formal definition. Since, if the vectors were linearly independent, they may not exist on the same line, plane, space, and, thus, the existence of an angle between vectors - possibly orthogonal vectors - exists so that their sums are less than or equal to the case in which they are linearly dependent.
Mar 10 2013 5:04AM
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Arabian
Posts: 667 - Karma: 880
*Sum of integrals of relevant piecewise *continuous* integrable functions, sorry.
Mar 10 2013 5:11AM
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Arabian
Posts: 667 - Karma: 880
Or, geometrically, each linearly dependent vector lies on the same line.
Mar 10 2013 5:12AM
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Arabian
Posts: 667 - Karma: 880
Use u-substitution.
Mar 10 2013 5:13AM
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Arabian
Posts: 667 - Karma: 880
And from these, the most interesting mathematical phenomena of our time - the Fundamental theorem of Algebra, and the impetus for Eigenspaces. Remarkable indeed.
Mar 10 2013 5:18AM
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Benedetto.
Posts: 2526 - Karma: 64
Threads for help/provide help
Mar 10 2013 9:12AM
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