A movie theater uses popcorn boxes in the shape of a right rectangular prism. Each box has a length of 9 inches, a width of 4 inches, and a height of 12 inches. What is the volume of the popcorn the box can hold?

The volume of a right rectangular prism is calculated by multiplying its length, width, and height.

Volume = length x width x height
Volume = 9 inches x 4 inches x 12 inches
Volume = 432 cubic inches

Therefore, the popcorn box can hold 432 cubic inches of popcorn.