First, you find the area of the 2 triangles:
2*1 = 2
Now, you find the area of the bottom rectangle:
3*1 = 3
Next, you find the area of the back rectangle:
2*3 = 6
Then. you find the area of the front rectangle:
2.2*3 = 6.6
Finally, you add all your sums up to:
2 + 3 + 6 + 6.6 = 17.6
The S.A. of the prism is 17.6 square feet.
