Maybe the town got settled by 10 people or by 1,000 people or who knows whatever else. So right over there. And this is taking the derivative of the rate function, which is, it's actually a little hard to think about what is this. This is the rate of change of the rate at time seven minus the rate of change of the rate at time two. So I would rule that one out as well. Let's do one more of these. So here we have, here we have the depth of water in a tank is changing at a rate of, r of t is equal to 0.3 t, centimeters per minute, where t is the time in minutes.