Now, let's see whether one of the students said that or what some of the other students wrote. So, can you match the teacher's comments to the justifications? So, one student wrote, the derivative of h is increasing when x is greater than zero. So, it is indeed the case that the derivative is increasing when x is greater than zero, but that's not the justification for why h is increasing. For example, the derivative could be increasing while still being negative, in which case h would be decreasing. The appropriate justification is that h prime is positive, not that it's necessarily increasing, because you could be increasing and still not be positive. So, let's see.