## Intermediate Algebra (6th Edition)

$f(9)=28.4$ This tells us that 28.4 percent of college students are taking at least one online course in 2009 (which is x=9 years after 2000).
We can find $f(9)$ by plugging $x=9$ into the given equation for $f(x)$. $f(x)=2.7x+4.1$ $f(9)=2.7\times9+4.1=24.3+4.1=28.4$