mathematics

Mr. Smith is draining his pool to have it cleaned. At 8:00 A. M., it had 2000 gallons of water

Mr. Smith is draining his pool to have it cleaned. At 8:00 A. M., it had 2000 gallons of water and at 11:00 A. M. it had 500 gallons left to drain. What is the rate of change in the amount of water in the pool?

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