The volume of a prism is just its width times its height times its length.
\(V = whl\)
\(V = 2 * 4 * 5\)
\(V = 40\)
So we know the volume is 40 units. But which units?
Matt used centimeters as his units, so his rect. prism's volume would be 40 cm³. Mindy's would be 40 in³.