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## Homework Statement

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?

## Homework Equations

## 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.