Answer
$F=\{ (A,1),(E,5),(I,9),(O,15),(U,21) \}$
Work Step by Step
$\bf{\text{Solution Outline:}}$
Use the function notation of ordered pairs which is given by
\begin{array}{l}\require{cancel}
F=\{ (x_1,y_1),(x_2,y_2),(x_3,y_3),... \}
.\end{array}
$\bf{\text{Solution Details:}}$
In terms of function, $F,$ the given table of values is equivalent to
\begin{array}{l}\require{cancel}
F=\{ (A,1),(E,5),(I,9),(O,15),(U,21) \}
.\end{array}