Answer
$f(x)=4^{-x}$
Work Step by Step
$f(x)=4^{-x}$
Use the table from exercise $4$,
$\begin{array}{|c|r|r|r|r|r|r|r|}
\hline
x & -3 & -2 & -1 & 0 & 1 & 2 & 3 \\
\hline
f(x) &64 & 16 & 4 & 1 & 1/4 & 1/16 & 1/64 \\
\hline
\end{array}$
Plot the points (x,f(x)) and join wih a smooth line.