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01162016, 05:26 PM  #9901  
LENNY
Join Date: Oct 2009
Location: m'appelle

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01162016, 05:33 PM  #9902 
I learn it from a book
Join Date: Jun 2011

Yeas I've drank a couple of beers but I think stuff's right!
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01172016, 08:28 AM  #9903  
LENNY
Join Date: Oct 2009
Location: m'appelle

Alright, back again with something I don't understand.
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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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01172016, 08:51 AM  #9904 
strč prst skrz krk
Join Date: Jan 2009
Location: Porto, Portugal

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.
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01172016, 10:03 AM  #9905  
LENNY
Join Date: Oct 2009
Location: m'appelle

Ah alright, yeah that sorta makes sense. I really have to start thinking in those terms come Saturday. Thanks, once again.
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01312016, 03:27 PM  #9906  
🤖
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)((3rh)/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: rh Upper limit: r Integrand: 2(pi)(y)(squareroot(r^2y^2) dy After doing a u substitution I eventually get pi((2/3)(2rhh^2)^3/20) Expanding the 3/2 exponent just gets me a bunch of fucking nonsense. It doesn't simplify out to be pi(h^2)((3rh)/3). Chances are I'm just setting it up all wrong.
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02072016, 08:26 PM  #9907  
MGTOW
Join Date: Jul 2011
Location: skating away on my heelys

Quick question:
Would I count the 27 values in the "25.5 up to 27" box or the "27 to 28.5" box?
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02072016, 08:30 PM  #9908  
cataloged vendee
Join Date: Jun 2015

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I read that as up to 27 but not including 27.....I would say the 2728.5 box 

02072016, 09:08 PM  #9909  
MGTOW
Join Date: Jul 2011
Location: skating away on my heelys

That was correct, good lookin out
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02072016, 09:19 PM  #9910 
cataloged vendee
Join Date: Jun 2015

glad to help...but yeah they could make it a little clearer
Last edited by mattedbird : 02072016 at 09:21 PM. 
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