So let's figure out our rate of change between 12, T equals 12, and T equals 20. So our change in velocity, that's going to be V of 20 minus V of 12, and then our change in time is going to be 20 minus 12. And so this is going to be equal to, V of 20 is 240, 240, V of 12, we see right there, is 200. And so this is going to be 40 over eight, which is equal to five. And we would be done. For good measure, it's good to put the units there. So this is our rate, this is how fast the velocity is changing with respect to time.