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December 10th, 2012, 04:57 AM   #1
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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!

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December 12th, 2012, 09:32 AM   #2
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Re: Upper and Lower Sums

Can you post the entire question?
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