Respuesta :

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

856 should be the answer