Answer:
544 in²
Explanation:
Find the area of the rectangle, then the triangle, then add them together to get the total SA.
Rectangle = l x w = 10 x 14 = 140 in²
SA of the 2 rectangular sides = 140 x 2 = 280 in²
Triangle = 1/2bh = 1/2(12)(8) = 48²
SA of the 2 triangular ends = 2 x 48 = 96 in²
Rectangular base = 14 x 12 = 168 in²
Total SA = 280 + 96 + 168 = 544 in²