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/hwk/ - Homework

Before you ask, google that shit first


Winner of the 75nd Attention-Hungry Games
/caco/ - Azarath Metrion Zinthos

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File: 08816fe9d37e1fb⋯.jpg (1.45 MB, 4096x2304, 16:9, 1539026318919-1190212908.jpg)


It's 1a and 1b, I don't get it.


File: d08f6c1f5bb8e13⋯.jpg (1.82 MB, 4096x2304, 16:9, 1539026448686-582577102.jpg)

Better image of the graph


Might be too late for this, but going to post the solution anyway.

For the first part, by the graph you have (0,4), so y = 4 when x = 0. They give you the equation y = Ae^(kx), so put the values for y and x in from the point you have:

y = A*e^(kx)

(4) = A*e^(k*[0])

4 = A*e^0

4 = A*1

4 = A

So you end up with y = 4e^kx. You don't have an exact way to find k given just this info, but you know that the function is exponential, and that the choices remaining show k as either being negative or positive. To figure out which it is, you need to look at the shape of the graph: if it approaches 0 as x increases, then the function is decaying and the exponent part of the function, and thus k, is negative. If it goes away as x increases, then the function is growing and k is positive. Looking at the graph, it's approaching zero as you're going right, so it's decaying and k is negative. There's only one choice from those three that has both A = 4 and k < 0, and that's y = 4e^(-3x).

Now that you know the equation of the curve, you can differentiate the equation to get the slope of the tangent line, or exact gradient, for any given x value. Here, you use the fact that d/dx(e^[a*x])=a*e^(a*x):

y = 4*e^(-3x)

y' = 4*(-3)*e^(-3x)

y' = -12*e^(-3*x)

Then find the exact gradient at each given x point:

y'(-1) = -12*e^(-3*-1) = -12*e^(3)

y'(0) = -12*e^(-3*0) = -12

y'(4) = -12*e^(-3*4) = -12*e^(-12)

File: 1463281667657.jpg (83.84 KB, 600x388, 150:97, no-cheating-cctv.jpg)


What's the best way to cheat on a supervised test without being caught?

This would be a fact and/or multichoice test

I am chinese

the Chinese government employs CCTVs and professional exam watchers, as well as wireless signal detector to prevent cheating by wireless


this being china,I would Bribe the exam watcher if that is economicaly feasible


microfilm in wristwatch

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File: cf5e97edcd7df09⋯.png (319.86 KB, 432x750, 72:125, tumblr_mrz4be2ThY1r76faho1….png)


You have been visited by the milk girl of bonzi chan.

Your lucky number is 7378

File: 1429983860264.jpg (290.45 KB, 840x556, 210:139, hwk sticky.jpg)


This board is for you retards who have trouble with homework questions/projects/whatever for college or (god forbid) high school with an emphasis on STEM-related homework.

You can post other questions from the humanities or non-STEM subjects but I can't guarantee that you'll get help other than from your textbook or class resources.

For now, the rules are:

1) Keep all your questions in one thread. If there's a thread for a major subject like Math or Physics, then post your question in that thread

2) Don't ask someone to write a paper for you. Do your share of the work, faggot. Asking for pointers is allowed. Just don't blame us if your professor catches you with his anti-plagiarism software

3) Don't put offtopic shit on this board.

4) Don't spam.

That's pretty much it. Don't forget that you have the internet, the vast collection of all human intelligence at your disposal, so make use of it before posting on /hwk/.


i hate writing essays


Why isn't this a sticky?


This board went fat.

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How do I do when difficult and insecure? Classmates are hard.

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i hate writing essays

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