Part C of the original question from MasteringPhysics.com:

"The surface temperature of the body is normally about 7.00°C lower than the internal temperature. Express this temperature difference in kelvins and in Fahrenheit degrees."

I'm assuming I have to use these numbers, 98.3°F and 36.9°C (Body Temperature calculated from Part A).

First, I just converted the difference of 7.00°C in to K and °F. I got the answer wrong. So then I did this: 36.9°C - 7.00°C = 29.9°C. Then converted 29.9°C to Kelvin by: 29.9°C + 273 = 302.9K. Then I converted the 29.9°C into °F by this: °F = °C(9/5)+32 so °F = 29.9°C(9/5)+32 = 85.82°F

Admittedly this seems a little low for surface body temperature, but I can't think of any other way to solve this problem.