Answer:
Explanation:
Surface area is the sum of the areas of all the sides.
The bottom side(the rectangle with dimensions 11.9 and 17.4): 11.9 * 17.4 = 207.06 * 1 = 207.06(because there is only one of this shape)
The rectangular sides(dimensions 10.5 and 14): 10.5 * 14 = 147 * 2 = 294 for both sides
The triangular sides(17.4 and 7): (17.4 * 7) / 2(because it a triangle) = 60.9 * 2 = 121.8(because there are two sides)
Add these up to get your surfacce area