Answer:
10 mi³
Explanation:
Since it is a pyramid, the formula is V = 1/3 Bh
So...
V = 1/3(1/2)(3*4)(5)
V = 1/3 (1/2*12)(5)
V = 1/3 (6)(5)
V = 1/3 (30)
V = 10
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