Answer
$f(x)=\dfrac{x}{2}+9$
Work Step by Step
"Divide by $2$, then add $9$"
Let $x$ be the independent variable for $f$
First, divide $x$ by $2$:
$\dfrac{x}{2}$
Now, add $9$ to the fraction:
$\dfrac{x}{2}+9$
The function described is $f(x)=\dfrac{x}{2}+9$
