In this situation, we can identify the initial value and the rate of change as follows:
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Initial Value (b): This represents the amount of water in the tank at the start. Since the tank is half full, initially there are 1,000 gallons of water. Therefore, \( b = 1000 \).
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Rate of Change (m): This refers to the rate at which water is being added to the tank over time. Water is being pumped into the tank at a rate of 15 gallons per minute. Therefore, \( m = 15 \).
So, in conclusion:
- The initial value is \( b = 1000 \)
- The rate of change is \( m = 15 \) gallons per minute.