Answer:
h = 9 in
Explanation:
Vol of a rectangular prism = L * W * H
L = 12 in
W = 8 in
H = ?
Vol = 864 inĀ³
vol = L * W * H
864 = 12 * 8 * H
H = 864 / (12 * 8)
H = 9 in
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