Answer
See explanations.
Work Step by Step
Step 1. Write the exponential model as $P(t)=P_0e^{kt}$ where $P_0=800,000$ is the initial population at $t=0$ and $k$ is a constant.
Step 2. Year 2013 gives $t=2013-2010=3$; we have $P(3)=1,000,000$ and $P(3)=P_0e^{3k}$ which sets up the equation for the unknown constant $k$.
Step 3. Solve the above equation to get the value of $k$ and write the model equation $P(t)=P_0e^{kt}$ with known numbers of $P_0$ and $k$.
