Which situation could be modeled by a linear function?
A. A bank account that grows at a rate of 5% per year, compounded annually
B. A population of bacteria that doubles every 4.5 hours
C. The cost of cell phone service that charges a base amount plus 20 cents per minute
D. The concentration of medicine in a person's body that decays by a factor of one-third every hour
answer CORRECTLY
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C. The cost of cell phone service that charges a base amount plus 20 cents per minute
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