



 
Hi David, You are using the correct expression for the volume. The shape is a right circular cylinder. First you need to convert the 22,000 gallons into cubic feet. Using your 7.5 gallons per cubic foot, 22,000 gallons is 22,000/7.5 cubic feet. The diameter of the pool is 30 feet so its radius r is 15 feet. Substitute these values into the expression
and solve for h, the height of the water. Penny  


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