Answer
Refer to Graph I and by way of Vertical Line Test, it is NOT a function.
The domain is $[3, \infty)$.
The range is $(-\infty, \infty)$.
Work Step by Step
Refer to Graph I and by way of Vertical Line Test,
it is NOT a function because each vertical line drawn will intersect the curve on the graph in more than one point.
Because there is a minimum x-value of 3, the values of x of the points on the curve will include all the real numbers greater than or equal to 3. The domain is $[3, \infty)$.
The values of y of the points on the curve will include all the real numbers between $-\infty$ and $\infty$ as the curve extends rightwards indefinitely up and down from 2. The range is $(-\infty, \infty)$.
