In 1985, there was 285 cell phones subscribers in the small town of centerville. After 1985, the number of subscribers increased by 75% per year. How many cell phones subscribers were in centerville in 1994?

First we write a function that suits the problem.

We have then:

y = 285 * (1.75) ^ x

Then, we see how many years there are in the requested period

x = 1994-1985 = 9

We evaluate the function for x = 9

y = 285 * (1.75) ^ 9

y = 43871.98637

Round nearest whole number

y = 43872

Answer:

there were 43872 cell phones subscribers in centerville in 1994