Let $S$ be the cube with vertices $( \pm 1 , \pm 1 , \pm 1 )$. Approximate $\iint _ { S } \sqrt { x ^ { 2 } + 2 y ^ { 2 } + 7 z ^ { 2 } }$ by using a
Riemann sum as in Definition 1, taking the patches $S _ { y j }$ to be the squares that are the faces of the cube and the points $P _ { i j }$ to be the centers of the squares.

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The Answer of Let $S$ be the cube with vertices $( \pm 1 , \pm 1 , \pm 1 )$. Approximate $\iint _ { S } \sqrt { x ^ { 2 } + 2 y ^ { 2 } + 7 z ^ { 2 } }$ by using a
Riemann sum as in Definition 1, taking the patches $S _ { y j }$ to be the squares that are the faces of the cube and the points $P _ { i j }$ to be the centers of the squares.

Let SSS Be the Cube with Vertices (±1,±1,±1)( \pm 1 , \pm 1 , \pm 1 )(±1,±1,±1)

Let $S$ Be the Cube with Vertices $( \pm 1 , \pm 1 , \pm 1 )$