Which situation can be modeled by a linear function? (1) a bank account that grows at a rate of 5% per year, compound annually. (2) a population of bacteria that doubles every 4.5 hours . (3) the cost of cell phone service that charges a base amount plus 20 cents per minute. (4) the concentration of medicine in a persons body that decays by a factor of on third every hour

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The situation that can be modeled by a linear function is (3) the cost of cell phone service that charges a base amount plus 20 cents per minute.