Question 1142369

I realize you are probably a high school student learning about functions for the first time.  You should attempt this on your own because it is fundamental to understanding a lot of math that will follow.  The posting of this question comes across as someone who does not want to exert the effort needed to learn. <br>

I will give you this hint: a function requires that a vertical line (a line parallel to the y-axis) cross the graph of that function no more than once, for ANY x-value that you choose to put that line on. My recommendation is for you to graph the three functions and see which pass this test.   Post/message what you think the answer is and I will help you from there.  The site desmos.com is an excellent graphing utility.