Answer:
630 ft³
Step-by-step explanation:
First find the volume of the prism(l·w·h)
8·7.5·7=420 ft³
Then, find the volume of the triangular prism(1/2·l·w·h)
8·7.5·7=420
420÷2=210 ft³
Finally, add the two volumes together to get 630 ft³
