Which situation could be modeled by using a linear function?
(1) a bank account balance that grows at a rate of 5% per year,
compounded 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 person’s body that decays by
a factor of one-third every hour