Hideki is draining a 45-gallon aquarium at a rate of 15 gallons per minute. What is the initial value of the linear function that represents this situation?

The initial value is the amount of water in the aquarium at the start, before any draining occurs. Hideki begins with 45 gallons, so the initial value is 45 gallons (choice C). The draining rate of 15 gallons per minute describes how quickly the amount changes, not the starting amount.

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