# Given the function k described by k (x) = x + 18, how do you find k(9)?

May 18, 2018

See explanation below

#### Explanation:

You have to replace $x$ by the number you are evaluating

The meaning of $k \left(x\right)$ is a "machine" that transforms each number $x$ to itself plus 18 units

In our case

$k \left(x\right) = x + 18$, then $k \left(\textcolor{red}{9}\right) = \textcolor{red}{9} + 18 = 27$
And so on....
$k \left(\textcolor{red}{2}\right) = \textcolor{red}{2} + 18 = 20$
$k \left(\textcolor{red}{- 1}\right) = \textcolor{red}{- 1} + 18 = 17$