What is the surface area of the prism?
a. 1296 in2
b. 1080 in2
c. 1188 in2
d. 1116 in2

Let's find the base first.

9*24*1/2 = 9*12 = 108

Now we multiply that by 2, as there are 2 triangles.

108*2 = 216

We'll find the 15 by 20 side next.

15 * 20 = 300.

Multiply that by 2, as there are 2 rectangles of those dimensions.

300*2 = 600

The last side is the 24 by 20 side.

24*20 is 480.

There's only one of those rectangles, so we won't multiply it by 2.

Now, we'll add all of our areas together.

216+600+480 = 1296.

Therefore the answer is A, 1296 in^2.

Hope that helps! :)