We see that right over there. Use the data in the table to estimate the value of not V of 16, V prime of 16. What we see here, they don't even give us V of 16, so how do we think about V prime of 16? Well, just remind ourselves, this is the rate of change of V with respect to time when time is equal to 16. So we can estimate it, and that's the key word here, estimate, we can estimate V prime of 16 by thinking about what is our change in velocity over our change in time around 16. When we look at it over here, they don't give us V of 16, but they give us V of 12, they give us V of 20. So let's figure out our rate of change between 12, T equals 12, and T equals 20.