Let V be the volume of the solid that lies below the plane 3x-9y+z20 and above...

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Let V be the volume of the solid that lies below the plane 3x-9y+z20 and above the rectangle R: (0,2]x(0,3] in the xy-plane. The estimate of V using Riemann sum with dividing R into 4 rectangles of equal areas, and choosing the sample point to be the lower right corner of each rectangle, is 44.5 40.5 13.5 133.5 89 Let V be the volume of the solid that lies below the plane 3x-9y+z20 and above the rectangle R: (0,2]x(0,3] in the xy-plane. The estimate of V using Riemann sum with dividing R into 4 rectangles of equal areas, and choosing the sample point to be the lower right corner of each rectangle, is 44.5 40.5 13.5 133.5 89