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01-16-2016, 05:26 PM   #9901
ali.guitarkid7
Awessum Pawesome

Join Date: Oct 2009
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Quote:
 Originally Posted by Dreadnought poo-tee-tweet, motherfucker

Quote:
 Originally Posted by jessielee739402 Assume I should on shit I be?

 01-16-2016, 05:33 PM #9902 ElMaco I learn it from a book     Join Date: Jun 2011 Yeas I've drank a couple of beers but I think stuff's right! __________________ http://i.imgur.com/47jKMcK.gif
01-17-2016, 08:28 AM   #9903
ali.guitarkid7
Awessum Pawesome

Join Date: Oct 2009
Alright, back again with something I don't understand.

Quote:
 Tickets for a show cost 3 dollars or 5 dollars. If 50 tickets were sold for a total of 230 dollars, how many tickets were sold for 3 dollars?

1. Now the explanation is (x = num. of tickets)

3x + 5(50 - x) = 230

2. I get that. Simple enough. Now this is where they lost me:

3x + 250 - 5x = 230

I get that they may have multiplied the cost of 5 dollar tickets by the total amount sold, but why? What does this actually represent? If you had to explain this through English, what would you say? And why subtract 5x from it?

3. This ends up being

2x = 20

and I get why this happens from the preceding line. It's just 5x - 3x = 250 - 230. What I don't understand, however, is what happens in step two. I understand that they're multiplying cost of tix * total sold, I just don't get what that means in logical terms.
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Quote:
 Originally Posted by Dreadnought poo-tee-tweet, motherfucker

Quote:
 Originally Posted by jessielee739402 Assume I should on shit I be?

 01-17-2016, 08:51 AM #9904 sickman411 ★   Join Date: Jan 2009 Location: Brussels, Belgium From the moment you've got the equation, you don't have to think in terms of "real world logic" anymore, all the real world logic has been incorporated into the equation. They're using the distributive property of multiplication. a*(b+c) = a*b + a*c To be able to add things together in equations, you usually need to "break down" everything that's inside brackets. So that happened because 5(50 - x) = 5*50 + 5*(-x) = 250 - 5x and now you can solve the rest of the equation. __________________ my soundcloud
01-17-2016, 10:03 AM   #9905
ali.guitarkid7
Awessum Pawesome

Join Date: Oct 2009
Ah alright, yeah that sorta makes sense. I really have to start thinking in those terms come Saturday. Thanks, once again.
__________________
Quote:
 Originally Posted by Dreadnought poo-tee-tweet, motherfucker

Quote:
 Originally Posted by jessielee739402 Assume I should on shit I be?

01-31-2016, 03:27 PM   #9906
CL/\SH
UG Knob

Join Date: Jul 2009
Alright, I don't expect to get an answer on this before tomorrow, if ever, but I've got a fucked up problem here.

Consider the cap of thickness h that has been sliced from a sphere of radius r. Verify that the volume of the cap is pi(h^2)((3r-h)/3) using the washer method, the shell method, and the general slicing method.

I can figure out how to do this with washer method (which doesn't seem at all different from the slicing method in this case?), but the shell method just comes out to a bunch of gibberish.

Lower limit: r-h
Upper limit: r

Integrand: 2(pi)(y)(squareroot(r^2-y^2) dy

After doing a u substitution I eventually get

pi((2/3)(2rh-h^2)^3/2-0)

Expanding the 3/2 exponent just gets me a bunch of fucking nonsense. It doesn't simplify out to be pi(h^2)((3r-h)/3). Chances are I'm just setting it up all wrong.
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 Yesterday, 08:26 PM #9907 ErikLensherr MGTOW     Join Date: Jul 2011 Location: my own way Quick question: Would I count the 27 values in the "25.5 up to 27" box or the "27 to 28.5" box? __________________ http://i.imgur.com/OEdlt6s.png
Yesterday, 08:30 PM   #9908
mattedbird
i've never heard of that

Join Date: Jun 2015
Location: anywhere is fine
Quote:
 Originally Posted by ErikLensherr Quick question: Would I count the 27 values in the "25.5 up to 27" box or the "27 to 28.5" box?

I read that as up to 27 but not including 27.....I would say the 27-28.5 box

 Yesterday, 09:08 PM #9909 ErikLensherr MGTOW     Join Date: Jul 2011 Location: my own way That was correct, good lookin out __________________ http://i.imgur.com/OEdlt6s.png
 Yesterday, 09:19 PM #9910 mattedbird i've never heard of that     Join Date: Jun 2015 Location: anywhere is fine glad to help...but yeah they could make it a little clearer Last edited by mattedbird : Yesterday at 09:21 PM.

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