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11a. Jada walks up to a tank of water that can hold up to 10 gallons. When it is
active, a drain empties water from the tank at a constant rate. When Jada first
sees the tank, it contains 8 gallons of water. Two minutes later, the tank contains
6 gallons of water. At what rate is the amount of water in the tank changing? Use
a signed number, and include the unit of measurement in your answer.
2 gallons per minute
1 gallon per minute
1/2 gallon per minute