1. The problem statement, all variables and given/known data In 2003 the city of spring field had a population of 250000 the population is expected to double by 2025, how many people in 2015? 2. Relevant equations 3. The attempt at a solution A=Pb^t The initial is 250000 and b is 2 because it doubles however I am unsure of what the exponent is I've tried but I can't get it. Also don't you have to put 500000 in A because we already know the final amount? Help is appreciated thanks.