Answer
$f(x)=3^{-x}$
Work Step by Step
$f(x)=3^{-x}$
Use the table from exercise 3,
$\begin{array}{|c|r|r|r|r|r|r|r|}
\hline
x & -3 & -2 & -1 & 0 & 1 & 2 & 3 \\
\hline
f(x) &27 & 9 & 3 & 1 & 1/3 & 1/9 & 1/27 \\
\hline
\end{array}$
Plot the points (x,f(x)) and join wih a smooth line.