## Functions Modeling Change: A Preparation for Calculus, 5th Edition

$a=79.2$, $r=0.002$
The value of $a$ can be seen without any rearrangement, since the coefficient is $79.2$ so $a=79.2$. $r$ can be found by using the fact that $$1+r=1.002 \implies r=1.002-1=0.002$$