Kimberly,
You need to change each of the dimensions from inches to feet. There are 12 inches in a foot and hence
38 inches is ^{38}/_{12} feet,
45 inches is ^{45}/_{12} feet, and
38 inches is ^{18}/_{12} feet.
Thus the volume is
^{38}/_{12} ^{45}/_{12} ^{18}/_{12} = 17.8 cubic feet
Penny
