Transcript text: Fill in the table using this function rule.
\[
f(x)=\sqrt{x}+2
\]
Simplify your answers as much as possible. Click "Not a real number" if applicable.
\begin{tabular}{|c|c|}
\hline$x$ & $f(x)$ \\
\hline-9 & $\square$ \\
\hline 0 & $\square$ \\
\hline 9 & $\square$ \\
\hline 16 & $\square$ \\
\hline
\end{tabular}