We're gonna subtract 66 degrees Celsius. This gives us negative 23 degrees Celsius. So our change in temperature is negative 23 degrees, or our temperature has gone down 23 degrees Celsius over the course of the first 10 minutes. So that is part, that is part C right over there. Now let's do part D, part D, D. At time t equals zero, biscuits with temperature 100 degrees were removed from an oven. So now we're talking about biscuits. We started with t, now biscuits.