So before I even read part a, let's just make sense of what this differential equation is telling us, and let's see if it's consistent with our intuition. So let me draw some axes here. So this is my y-axis, so that is my y-axis, and this right over here is my t-axis. Now if the ambient room temperature is 27 degrees Celsius, so I'll just draw there, that's what the room temperature is doing, and so we know at t equals zero, our potato is at 91 degrees, so let's see, that's 27, 91 might be right over there. 91, this is all in degrees Celsius, and what you would expect intuitively is that it would start to cool, and when it's temperature, when there's a big difference between the potato and the room, maybe its rate of change is steeper than when there's a little difference. So you would expect the graph to look something like this. So you would expect it to look something like this, and then asymptote towards a temperature of 27 degrees Celsius.