Because there are different types of math used for different types of problems
The formula for the area of a rectangular prism is
V=l*w*h
In this case, the l=(3+3+3+3=12)12in, the w=(3+3+3+3=12)12in, and the height=(3+3+3+3+3=15)15in
plug in the data we know
V=12*12*15
V=144*15
V=2160in³
It go vroom! vroom vroom vroom
