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Let R denote the region that lies below the graph of y = f(x) over the...

Let R denote the region that lies below the graph of y = f(x) over the interval [a, b] on the x axis. Calculate an underestimate and an overestimate for the area A of R, based on a division of [a, b] into n subintervals all with the same length delta(x) = (b - a)/n.

f(x) = 9 - x2 on [0, 3]; n = 5

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