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Simply that, derive the formula for the left rectangle sum $f(x)=x^2+1$ from $0$ to $3$

This is when you use like rectangles and Riemann sums to approximate an integral. Not really sure what this means to derive the formula ?

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    see example at: http://en.wikipedia.org/wiki/Riemann_sum2012-09-05
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    It's not clear to me whether you don't know the formula for the left rectangle sum, or whether you know it but you don't know how to get to it. To derive a formula means to show how someone might arrive at that formula. Roughly speaking, it means to prove that the formula is correct.2012-09-05
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    Yea I can work these problems out, it's pretty straightforward compared to the rest of calculus . But I'm not good at proofs though like don't even understand what its asking me to put down at all.2012-09-05

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