A 2000 gallon tank is half full with 1000 gallons of water. Water is being pumped into the tank at a rate of 15 gallons per minute

The initial valve is b = ___ and the rate of change is m = __

The initial valve, representing the amount of water in the tank at the start, is b = 1000 gallons.

The rate of change, representing the rate at which water is being pumped into the tank, is m = 15 gallons per minute.