Given:
The Population of Brownsville is 20,000 in year 2010.
Consider the population function

To find:
The population in 2012.
Solution:
The population function of Brownsville is

The Population of Brownsville is 20,000 in year 2010.
So, the given function P(t) represents the population of Brownsville after t years of 2010.
2012 is 2 years after 2010.
Putting t=2 in P(t), we get



Therefore, the Population of Brownsville is 26,450 in year 2012.