The answer is D.... starting the on back rectangle the area is 72 (6 x 12) next the area of the 2 triangles sides totals to 48 (or 24 on each side) as base x height (6x8) is 48, divided by 2 is 24 then the base rectangle is 8x12= 96 then the top rectangle is 10x12=120 72+48+96+120=336
The first step is to find the area of the triangular base. . Now you can multiply by the length of the prism, 12, to find the volume. 12*24=288, or option C. Hope this helps!
