Do the following.

a = 20

(a) By reading values from the given graph of f, use five rectangles to find a lower estimate and an upper estimate for the area under the given graph of f from x = 0 to x = 40.

A 1 (lower estimate)

A 2 (upper estimate)

(b) Find new estimates using ten rectangles in each case.

A 3 (lower estimate)

A 4 (upper estimate)

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