Answer:
9 ft
Step-by-step explanation:
The wall has the shape of a rectangle. Let H represent the height of the wall. Then, in terms of H, the length is 2H.
The area of the wall is given: 162 ft. This is equal to A = H(2H), or 2H^2.
Equating 162 ft and 2H^2, we get H^2 = 81, so that H must be 9 ft.
