$\"\"$

(a).

The equations are $\"\"$ , $\"\"$ and $\"\"$ .

Graph :

(1) Draw the coordinate plane.

(2) Graph the equations $\"\"$ , $\"\"$ and $\"\"$ on the same graph in first quadrant.

$\"\"$

(b).

By using the graphing utility :

The volume can be calculated by $\"\"$ .

Here $\"\"$ , $\"\"$ .

$\"\"$ .

By using the graphing utility the volume is $\"\"$ .

$\"\"$

(a).

Graph :

$\"\"$

(b).

Volume is $\"\"$ .