# Given the function k described by k (x) = x + 18, how do you find k(-11)?

$k \left(- 11\right) = 7$
$k \left(\textcolor{red}{- 11}\right) = \textcolor{red}{- 11} + 18 = 7$
As you can see every occurence of variable $x$ is replaces with number $- 11$