The domain of a function is all of the "x" values which the function assumes. According to this graph, as you approach the right, it seems like the function keeps going until infinity. As you approach the left, the function seems to be unable to have "x" values equal and less than 0. In other words, the line of the function starts at an "x" value close to 0. Therefore, "x" can be any value above 0.
