If it's the same priority, why can't I just do all multiplication first then all division? Other than obviously getting the wrong answer.
Edit: nvm I figured it out. Lol I feel like an idiot.
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11-03-2015, 09:29 AM #5941
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11-03-2015, 09:36 AM #5942
You can, but you haven't written down the problem clearly. You need parenthesis.
The last 3 you have is in the numerator, not the denominator. For it to be in the denominator you need to write the problem as (16*3)/(2*3).
If you do all the multiplication first, you have 16*3*3/2=144/2=72 which is correct.Trading/Investing Thread Crew
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11-03-2015, 04:47 PM #5943
What is it you're trying to figure out? How they got the equation for the line? If you read how to do it in your book and then ask specific questions about what you don't understand it's much easier to help.
What's the context/model specification? It almost looks like two-staged least squares regression, but not quite. Either way, 2 equations with 2 unknowns is solvable, but then then they give you solutions that don't solve the system? Seems puzzling...Last edited by Tharsos; 11-03-2015 at 04:54 PM.
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11-03-2015, 05:03 PM #5944
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11-03-2015, 07:04 PM #5945
Last semester while taking trig this problem was presented. It was extra credit but few could do it at the time and everyone that did came up with a different answer. I still dont get it. I want picture explanation(im willing to paypal):
Fresh out the neg prison.
Went in benching 1 plate
Left benching 3 nomsayin?
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11-06-2015, 02:32 AM #5946
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11-06-2015, 03:34 PM #5947
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11-06-2015, 06:22 PM #5948
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11-06-2015, 06:25 PM #5949
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11-06-2015, 06:26 PM #5950
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11-06-2015, 06:27 PM #5951
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11-06-2015, 06:28 PM #5952
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11-07-2015, 06:53 AM #5953
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11-07-2015, 04:23 PM #5954
Can someone explain to me how a = 2Rcos(theta) from the picture? Presumably law of cosines? I've tried law of cosines but still can't get what they are getting. R is the radius of the circle.
This is a stepping stone in a larger problem of finding the potential on the edge of a uniformly charged circular disk (or radius R).**30 tabs open and can't tell which one the sound is coming from crew**
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11-07-2015, 04:51 PM #5955
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11-07-2015, 09:59 PM #5956
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11-08-2015, 12:04 AM #5957
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11-08-2015, 10:31 AM #5958
In general: given a function z = f(x,y) and a point (a,b) such that c = f(a,b) and f is differentiable at (a,b), here is how to find the equation of the tangent plane (perhaps more aptly called parametrization of the tangent plane) at the point (a,b,c).
I will denote this parametrization by T(x,y). Let d/dx and d/dy denote partial derivatives with respect to x and y, respectively. Then T(x,y) = c + ( d/dx f(a,b) ) * (x-a) + ( d/dy f(a,b) ) * (y-b).
To solve your problem, just let f(x,y) := exp(-xy), compute all relevant terms, and plug them into what I wrote above.
In order to help understand why what I said is true, you should make an analogy with the one-dimensional version of this problem. I.e., given a function y = g(x) differentiable at the point a with b = g(a), the parametrization of the tangent line to the graph of g at the point (a,b) is given by L(x) = b + g'(a) * (x-a).Kroger Carbmaster vanilla milk crew
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11-08-2015, 10:57 AM #5959
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11-08-2015, 11:43 PM #5960
thanks bro
i got an exam in 12 hours, i still need to know alot of sh!t
ive been having 4 hours of sleep per day for the past 3 days
i did past paper and only got 15/40 and i need 23/40 to pass
should i only get 2 hours of sleep? i want to try do 3 more past papers before i walk into the exam.
PLEASE NEED ADVICE BROS
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11-09-2015, 11:55 PM #5961
Anybody understand how to do this problem ? 66
http://i.imgur.com/WWYGK5K.jpg
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11-10-2015, 01:17 PM #5962
-Professor asks us a Stats Question
-We all think the answer is "the sample mean"
-Spend 30 mins thinking among ourselves
-Professor throws smart pen at the wall, ceiling, and his desk because we cant answer
-Is frustrated
Answer ended up being the Population Mean. Anyone else have a teacher rage at the class? The way he worded the question threw me off personally
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11-10-2015, 02:40 PM #5963
All nighters and math exams don't mix all that well, especially since it seems like you have incurred a significant sleep debt. If you really have to do it, I'd recommend sleeping for a multiple of 1.5 hours, e.g. either 1.5, 3, or 4.5 (more the better obviously), so you can awake at the end of a sleep cycle and not in the middle of REM sleep.
You can use http://sleepyti.me to help determine when to sleep
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11-11-2015, 01:53 PM #5964
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11-11-2015, 02:52 PM #5965
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11-11-2015, 03:03 PM #5966
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11-11-2015, 07:25 PM #5967
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11-11-2015, 09:29 PM #5968
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11-17-2015, 05:35 PM #5969
- Join Date: Jan 2010
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Next exam is coming soon and while I understand these topics conceptually, I find I have a terribly difficult time recognising what I can say from a given question--which I guess means I don't truly understand it conceptually. Heh...
Example:
Talked to instructor about this one and he warned me about the way I did this. He said we cannot state that c1 or any other concrete c is zero simply because there is a dependence relation. We know at least ONE of them is zero, but we cannot write it. (still a bit confused)
He said it is fine as long as we define an arbitrary c to be zero and solve for its respective vector. That's what I tried here--which I still don't understand because it seems like the same thing to me.
Another:
Last edited by SCAR-H; 11-17-2015 at 06:38 PM.
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11-17-2015, 07:30 PM #5970
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