## Algebra 2 (1st Edition)

The average yearly increase was $\frac{38.23-21.62}{2004-1994}=\frac{16.61}{10}=1.661$. Thus the equation (if the years passed since 1994 is $x$) is: cost$=21.62+1.661x$. Hence at 2010, $x=16$, thus: cost$=21.62+1.661\cdot16=48.196$.