(1 point) Consider the solid that lies above the square (in the xyxy-plane) R=[0,1]×[0,1]R=[0,1]×[0,1], and below the elliptic paraboloid z=64−x2+4xy−2y2z=64−x2+4xy−2y2. Estimate the volume by dividing RR into 9 equal squares and choosing the sample points to lie in the midpoints of each square.