We are told the differentiable function h and its derivative h prime are graphed. And you can see it here, h is in blue, and then its derivative h prime is in this orange color. Four students were asked to give an appropriate calculus-based justification for the fact that h is increasing when x is greater than zero. Can you match the teacher's comments to the justifications? So, before I even look at what the students wrote, you might say, hey, look, I can just look at this and see that h is increasing when x is greater than zero. But just by looking at the graph of h, that by itself is not a calculus-based justification. We're not using calculus.