determine the volume of each rectangular or triangular prism round to the nearest tenth if necessary

Determine the volume of each rectangular or triangular prism round to the nearest tenth if necessary
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volume = base (B)* height (H)
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Base area
Triangle
B = b*h/2
Rectangle
B= L1*L2
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volume = base (B)* height (H)
H= 15
Triangle case
B = 4.8 *9.6 /2
B = 46.08 / 2
B= 23.04
V= 23. 04* 15
V= 345.6 in ^3