8. In 1985, there were 285 cell phone subscribers in the small town of Centerville. The subscribers increased by 75% per year after 1985. (Don't consider a fractional part of a person.) Years since 1985 Number of Cell Phone users 1 9 2 3 4 5 6 7 8 498 872 1527 2672 4677 8186 14325 25069 43871 a) Determine an equation for a function that models this data set. (Round to the nearest hundredth b) Use your model to predict the number of cell phones in 1997. c) Is this an example of exponential growth or decay?