Step-by-step explanation:
So, we know that the width in this image has a length of 7 feet. decreasing it by two will give us 5 feet. Now, we can solve the surface area.
Lateral faces: 7 x 14 x 4 = 392
Bases: 14 x 13 x 2 = 364
Add them all up, and we get 756 ft²
