Math

Which choice could be modeled by a linear function?

A. The amount of money, y, in an account after x years earning 4% interest compounded annually
B. The monthly cost, y, to use a cell phone for x minutes at a rate of 4 cents per minute
C. the height, y, of a ball after bouncing x times, if each bounce reaches ⅔ the previous height
D. the amount, y, of radioactive material remaining after x years when decay occurs at a rate of 30% each year

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  1. The monthly cost, y, to use a cell phone for x minutes at a rate of 4 cents per minute

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