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August 11th, 2009, 11:04 AM  #1 
Senior Member Joined: Jul 2009 Posts: 136 Thanks: 0  my result differs from the text, but where?
The problem is simple (I think): find H when H = plAN /33000 when p = 8, l = 2, A = 80, N = 360 So...I multiplied 8 x 2 x 80 x 360 and divided the product by 33000. The fraction becomes 460800 / 33000 = 13.963636. But the text answer offers 31.4 to 1 decimal place as the answer. Am I wrong or is this an error in the text? And if I'm wrong, what could be wrong? Seems as a very simple problem. Thanks for your help! 
August 11th, 2009, 11:30 AM  #2 
Senior Member Joined: Apr 2007 Posts: 2,140 Thanks: 0 
The text answer is mathematically incorrect, if you've laid out the problem in this post correctly from the text (also text stating the problem correctly). If the problem above should include additional details and/or the problem is stated wrong by you, then I cannot determine that the text answer is right or wrong. Also, it's an possibility that the text incorrectly stated the problem, where the answer by the text is supposed to be correct.

August 11th, 2009, 04:04 PM  #3 
Global Moderator Joined: Dec 2006 Posts: 20,484 Thanks: 2041 
The text answer is obtained if A = 180 instead of 80.

September 17th, 2009, 05:48 PM  #4 
Senior Member Joined: Jul 2009 Posts: 136 Thanks: 0  Re: my result differs from the text, but where?
Oh, I'm just getting back to this, sorry.... Yes, the text is incorrect as you stated. I have found a few others but I suppose that's not so bad for the first 122 pages of a math textbook. I appreciate everyone's help! 

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