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double integrals
Estimate the volume of the solid that lies below the surface
z=xy and above the rectangle R − hsx, yd | 0 < x < 6, 0 < y < 4j
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
in part (a).