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To determine the volume of the pyramid, we can use the formula:
Volume = (1/3) * base area * altitude.
First, let's find the base area, which is the area of a square with side length 112 feet:
Base area = 112 ft * 112 ft = 12,544 ft^2.
Now, we can calculate the volume:
Volume = (1/3) * 12,544 ft^2 * 71 ft
= 890,624 ft^3.
Therefore, the correct answer is:
890,624 ft.3 or 890,624 feet cubed.