Answer
f(x) = $\frac{x}{2}$ + 9
Work Step by Step
If x is the input and f(x) is the function
First you divide the input by 2 ($\frac{x}{2}$)
Then add 9 to it ($\frac{x}{2}$ + 9)
f(x) = $\frac{x}{2}$ + 9
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