# Math Help - advanced counting

Hello people. I have no idea how to solve this.
Can you please solve with explanation so I can solve the rest of my excercises by myself?

2. This is high school math.

$\mbox{Let }N(n)\mbox{ denote the population in billions. Then }N(n)=6*0.013^n$ $\mbox{ and the recursion relation is }N_{n+1}=1.013N_{n}.$