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Explanation & Answer
42.) Solid is a rectangular prism. (Or rather a box)
Length: L = 12.5 in Width: W = 3 in Height: h = 12.5 in
Volume of a rectangular prism (box): V = L*W*h
V = (12.5)*(3)*(12.5) <Substitute variables and evaluate>
V = 468.75
Keep in mind that the units for your volume should include the "cubic" or ^3 part.
SOLUTION: Volume is 468.75 in^3
43.) Solid is a triangular base prism.
Length: L = 40 cm Base: b = 20 cm Height of Base: h = 5 cm
Volume of a triangular prism: V = (1/2)*b*h*L
V = 0.5*b*h*L <1/2 is the same as 0.5>
V = 0.5*(20)*(5)*(40)
V = 2000
SOLUTION: Volume is 2000 cm^3
45.) Solid is a cone
Radius: r = 3 in. Height: h = 4 in.
Volume of a cone: V = (1/3)*pi* r^2 * h
V = (0.333333)*(3.14)*r^2 * h <1/3 = 0.33333... pi = 3.14>
V = (0.333333)* (3.14)* (3^2) * (4)
V = (0.333333) * (3.14) *(9) * (4) <Square the radius first>
V = 37.7
SOLUTION: Volume is about 37.7 in^3
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