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Shouldn't x be 8?
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I believe you are right. I forgot to picture the cross-section. Damn my waning pre-calc skills.
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Z? What do I put into Z? Do I solve for Z?
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Edited by Ginger: 11/26/2013 5:53:51 AM2=(1/4z)16^2, then solve for z.
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Edited by Ninja Guardian: 11/26/2013 5:58:44 AMI get Z=2/64. Is that right? Yeah 2/64 feet sounds way too low. Then again its only 2 feet deep.
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You didn't isolate z correctly. z=32: 2=(1/4z)256 , 2=(1/z)64, 2z=64, z=32 You can also use the equation x^2=4zy to get the same answer.
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Edited by Ninja Guardian: 11/26/2013 6:11:08 AMOkay, so the answer is 32 feet? Also, thanks.
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See Euler above; x should be 8 because you have to take the cross-section. So resolve the equation by plugging 8 in instead of 16 and you get...8.
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Edited by Ninja Guardian: 11/26/2013 6:34:43 AMAh crap I think I got it wrong then. And I can't see the results of the quiz until it closes tomorrow. Okay so it looks like the answer should have been 8 then.
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Perhaps, but at least you know how to solve the problem now. Hopefully it wasn't worth too many points. I haven't done pre-calc since 2003, so I gave it my best shot. Thanks Euler for pointing that out to me.
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Yeah, I still got an 87% on the quiz, got the satellite problem wrong and I only got half credit on another problem. Good thing its an easy to remember formula. y=(1/4z)x^2
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Indeed. Good luck on future math stuff. Euler is your go-to-guy. :)
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Should be.