1) Volume of a rectangular prism ⇒ length · width · height
Plug the numbers in.
7 ft · 4 ft · 5 ft = 140 ft³
A) 140 ft³
2) Count the cubes for length, width, and height.
6 · 5 · 3 = 90
A) 90 cm³
3) The same thing, solve for a rectangular prism using length · width · height.
5 · 3 · 4
D) 5 x 3 x 4