## Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Domain = $\{x\in \mathbb{R}\ |\ x\leq 3\}$, or $(-\infty,3]$ Range = $\{y\in \mathbb{R}\ |\ y\geq 0\}$, or $[0,\infty)$
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 real number, left of and including 3. Domain =$\{x\in \mathbb{R}\ |\ x\leq 3\}$, or $(-\infty,3]$ The second coordinate can be any nonegative real number, ( 0 and upwards ) Range = $\{y\in \mathbb{R}\ |\ y\geq 0\}$, or $[0,\infty)$