Since the pool has 9 feet of water, but is 10 feet deep, we can use theA rectangular swimming pool 50 ft long by 20 ft wide and 10 ft deep is filled with water to a depth of 9 ft. Use an integral to find the work required to pump all the water out over the top.

This one I thought would just be the integral from 0 to 10 of

50 x 20 x 9 x density of water per cubic foot times y dy but I am not getting the correct answer.

Thank you for making this site so helpful and helping not pull all of my hair out!!!!!