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They most certainly don't. You need to glance back at the book one more time.
Yes - of course it is !
if the interior of the safe is 14" cubed, then the volume is of course 14^3 inches which is 2744 cubic inches.
If you multiply the three numbers, you'll get the volume (in cubic millimeters). Assuming, of course, you were working with a rectangular block shape.
mass = volume x density. The units, of course, have to be compatible - for example, if the volume is in cubic meters, and the density in kilograms per cubic meter, the mass will naturally be in kilograms.