December 10th, 2012, 05:57 AM  #1 
Newbie Joined: May 2012 Posts: 22 Thanks: 0  Upper and Lower Sums
I understand everything in these, except where the second values in the multiplication come from. For example, for the upper sum: (1)(f(1.5)) + ... I have no idea where the (f(1.5)) came from. Any help would be much appreciated! 
December 12th, 2012, 10:32 AM  #2 
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,155 Thanks: 463 Math Focus: Calculus/ODEs  Re: Upper and Lower Sums
Can you post the entire question?


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