Answer
Domain = $\{x\in \mathbb{R}\ |\ x\geq 0\}$, or $[0,\infty)$
Range = $\{y\in \mathbb{R}\ |\ y\geq 0\}$, or $[0,\infty)$
Work Step by Step
If the function is described by a graph, then the domain is the set of all first coordinates of the points on the graph. The range is the set of all second coordinates.
The first coordinate of a point of the graph can be any nonnegative real number, ( 0 and onwards to the right )
Domain =$\{x\in \mathbb{R}\ |\ x\geq 0\}$, or $[0,\infty)$
The second coordinate can be any nonnegative real number,
( 0 and upwards )
Range = $\{y\in \mathbb{R}\ |\ y\geq 0\}$, or $[0,\infty)$
