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The correct solution is: 4,578.12 ft. ^3
The formula for the volume of a cylinder is V = πr^2h, where r is the radius and h is the height.
Plugging in the values:
V = 3.14 * (9 ft)^2 * 18 ft
V = 3.14 * 81 ft^2 * 18 ft
V = 4,578.12 ft. ^3
Therefore, the volume of the cylinder is 4,578.12 ft. ^3.