These are pretty close around four. And so let's do that. Let's find the average rate of change between when x goes from three to five. So we can see here our change in x, let me do this in a new color. So our change in x here is equal to plus two, and I can draw that out. My change in x here is plus two, and my change in y is going to be, when my x increased by two, my change in y is plus, let's see, this is, if I add 10, I get to 105, and then I add another seven, so this is plus 17. So this is plus 17 right over here.