Which equation correctly determines the amount of material used, M, to construct the fully enclosed tent?

Answer:
B) M = (8 x 9) + 2 x (7.5 x 8) + 2 x ( 1/2 x 9 x 6)
Step-by-step explanation:
Triangular prism area:
B) M = (8 x 9) + 2 x (7.5 x 8) + 2 x ( 1/2 x 9 x 6)