Question

This is just practice to help my understanding thanks for the help

Answer 1

In order to calculate f(-18), we need to identify which part of the piecewise function will be used.

We can see that the first part is exactly for the value x = -18, so this part will be used to calculate f(-18).

So we have:

$\begin{gathered} f(x)=\frac{x-6}{3} \\ f(-18)=\frac{-18-6}{3} \\ f(-18)=\frac{-24}{3} \\ f(-18)=-8 \end{gathered}$

Therefore f(-18) = -8.