I have the same question and I have no idea sorry
The region in the <em>x</em>-<em>y</em> plane is the set of points

The height of the solid falls between the <em>x</em>-<em>y</em> plane (for which <em>z</em> = 0) and the equation of the plane, <em>z</em> = 3<em>x</em> + 2<em>y</em>.
So the volume is




642.2 is the answer if you multiply 3.8x169