Answer
$\text{Domain: }
(-\infty,\infty)
\\\text{Range: }
[-1,\infty)
\\\text{The graph is a function}
$
Work Step by Step
The $x-$values of the given graph can be any number. The $y-$values is from $-1$ and higher.
A vertical line drawn anywhere will intersect the graph at only one point.
Using the information above, the given graph has the following characteristics:
\begin{array}{l}\require{cancel}
\text{Domain: }
(-\infty,\infty)
\\\text{Range: }
[-1,\infty)
\\\text{The graph is a function}
.\end{array}
