In 1985, there were 285 cell phone subscribers in the small town of Centerville. The number of subscribers increased by 75% per year after 1985. How many cell phone subscribers were in Centerville in 1994?

We have the following exponential function

N = 285 (1.75)^{x} where N is the number of subscribers after x years

Since 1994 is 9 years after 1985, we have

N = 285 (1.75)^{9} ≈ 43,872 subscribers

( That's a pretty big increase !!! }