Loading...
$\begin{tabular}{|c|c|} \hline $x$ & $f(x)$ \\ \hline<br/>1 & 5 \\ \hline<br/>3 & 13 \\ \hline<br/>5 & 21 \\ \hline \end{tabular}$ Some values of the linear function $f$ are shown in the table above. Which of the following defines $f$ ?