5/3 is the simplified slope.
B. 75
First you find the area of the triangle:
(base x height)/2
(3 x 5)/2
15/2
7.5
Then you multiply by the length of the prism (10):
7.5 x 10 = 75
I think it wants you to multiply the numbers.
329×2=658
658×4=2632
Final Answer=2632