Answer:
The length is 6.
Step-by-step explanation:
The volume of a right rectangular prism is given by
V = l*w*h where l is the length, w is the width and h is the height.
90 = l * 3 * 5
90 = 15 l
Divide each side by 15.
90/15 = 15l/15
6 = l
The length is 6.
