IDNLearn.com: Where your questions meet expert advice and community insights. Find in-depth and trustworthy answers to all your questions from our experienced community members.

in 1995,there were 400 cell phone subscribers in the small town of Centerville. the number of subscribers increased by 50% per year after 1995 .

how many cell phone subscribers were in Centerville in 1999 ?
( the equation has to be in y = ab^x where y is the number of phone users and x is the years after 1995)

(show work)​