Can someone me ? can you also explain? 20 points!

Surface area will consist of:
2 triangles, 3 rectangles:

Solving for triangles:
A=1/2bh
A=1/2(120)
A=60
60*2 gives us the surface area of both triangular sides.

Solve for rectangles:
(17*20)+(8*20)+(15*20)
(340)+(160)+(300)
(800)

800+120=920
The surface area of the prism is 920 square feet

1- is d 4- is b 3 is d