David W. answered 11/11/15
Tutor
4.7
(90)
Experienced Prof
The volume of a box = height * width * length.
The base is square, so width=length. That makes the volume of a square box = height * length * length.
The volume = 252 cu in. The height = 7 inches.
252 = 7 * L * L
36 = L*L
L = 6 inches (take the square root of both sides)