So this is really just a graph showing how it cools off over those 10 minutes. That's what the data is telling us. It's kind of a curve like this, and we've sampled it at these points. So going back to part A, use the data in the table to approximate the rate at which the temperature of the T is changing at time T equals 3.5. So the rate of change is really just the slope of this curve at time T is equal to 3.5. So really, we just want to find the slope at that point right over there. We want to find the slope.