Since the parabola can take any x-value, we can say that its domain is all real numbers. On the other hand, we know that the maximum value is 13, this means that the range is given by
[tex]y\in(-\infty,13\rbrack[/tex]Therefore, the answers are:
[tex]\begin{gathered} D\text{omain:} \\ x\in(-\infty,\infty) \\ \text{Range:} \\ y\in(-\infty,13\rbrack \end{gathered}[/tex]