Explanation:
this is a college question ? oh, my ...
the area of a rectangle is
length × width
the 2 walls are 2 rectangles.
15 3/4 × 10
13 1/2 × 10
to be sure, let's convert both mixed numbers to full fractions :
15 3/4 = (15×4 + 3)/4 = 63/4
13 1/2 = (13×2 + 1)/2 = 27/2
so, the areas are
63/4 × 10 = 630/4 = 315/2 ft²
27/2 × 10 = 270/2 ft²
in total that is
315/2 + 270/2 = 585/2 = (584/2 + 1)/2 = 272 1/2 ft²