Explanation:
To begin, we start with domain, or what the input could be. As the input for a 2D graph is (typically) the x value, and the line is moving off of the graph, we can assume that x is going to infinity. Furthermore, we know that the lowest point of x is 0 as there is one point at x=0 and there is nothing suggesting that x will be any lower. Therefore, the domain for x is [0,∞). There is a hard bracket next to the 0 because the function achieves x=0, but the function never truly reaches infinity, so the infinity simply has a parenthesis next to it.
Next, for the range, or what y can be, as the graph is going up and down with no end in sight, we can say that the range is (-∞, ∞).
Finally, a function can be defined as "[a] special relationship where each input has a single output.". As some inputs, or x values, have multiple y values ( for example, at the third positive x line, there is a point on the line both above and below it), this is not a function.