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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 the cell phone service that charges a base amount plus 20 cents per minute

3) the concentration of medicine in a persons body that decays by a factor of one- third every hour

Verified Answer :

AL2006

Nuimber-3 (the number-3 that talks about cell phone service)
is the only choice that produces a straight pine on a graph. 
The others all produce curves.

3) the cost of the cell phone service that charges a base amount plus 20 cent per minute

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