Estimate the Volume of the Solid That Lies Above the Square

Short Answer

Estimate the volume of the solid that lies above the square $R = [ 0,4 ] \times [ 0,4 ]$ and below the elliptic paraboloid $f ( x , y ) = 68 - x ^ { 2 } - y ^ { 2 }$ .
Divide $R$ into four equal squares and use the Midpoint rule.