An aquarium tank containing 210 gallons of water is being drained at a rate of 30 gallons per hour. The linear function w(x) = –30x + 210 models the amount of water in the tank, where x is the number of hours and w(x) is the total number of gallons in the tank. What is the domain of the function?  (–∞, ∞) [0, 210] [0, 30] [0, 7]

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