Estimate the volume of the solid that lies below the surface z = xy and above the following rectangle. R = {(x, y) 16 ≤ x ≤ 12, 6 ≤ y ≤ 10} (a) Use a Riemann sum with m = 3, n = 2, and take the sample point to be the upper right corner of each square. (b) Use the Midpoint Rule to estimate the volume of the solid.

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