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
