All right, let's do this first part first. The average rate of change of f on the interval. Sounds like a very fancy thing, but the average rate of change on the interval is really just the slope of the line that connects the endpoints of the interval. So this right over here, those are the endpoints, and let's figure out the slope of that line. So going from this point to that point, our change in x, which is in a color that you're likely to see, our change in x over here, our change in x is equal to seven. And you could get that by taking three minus negative four. You could literally just count.