Triangular prism
length of slanted side:
sqrt(3^2 + 4^2) = 5
SA = 2(1/2)(8)(3) + 8(12) + 2(5)(12) =240
V = (1/2)(8)(3)(12) = 144
cuboid
SA = 2(7x6) + 2(7x5) + 2(6x5) = 214
V = 7x6x5 = 210
A, because:
Hardcover: 0.35
Buys hard cover and non-fiction: 0.35 x 0.55 = 0.1925
This is a combination problem.
6 nCr 2

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Answer:
B
Step-by-step explanation:
Cube root of 27 is 3, which is in integer
9 plates x 15 cups = 135 total cups.
135 cups x 10 chocolate balls = 1,350 total.