In the given scenario:
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The initial value \( b \) is the amount of water in the tank at the beginning. Since the tank is half full with 1,000 gallons of water, we have: \[ b = 1000 \text{ gallons} \]
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The rate of change \( m \) represents the rate at which the water is being added to the tank. Since water is being pumped into the tank at a rate of 15 gallons per minute, we have: \[ m = 15 \text{ gallons per minute} \]
Thus, the initial value \( b \) is 1000 gallons, and the rate of change \( m \) is 15 gallons per minute.