The dependent variable is gallons of water remove; the independent variable is the time.
The dependent variable (y) of a function changes as the independent variable (x) of the function changes.
If the pump removes the water at an average rate of 15 gallons per minute, then the gallons of water is a function of time.
This means that, the gallons of water removed is dependent on time or changes as time changes.
Therefore, the dependent variable is gallons of water remove; the independent variable is the time.
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