Question: A yam has just been taken out of the oven and is cooling off before being eaten. The temperature, T , of the yam (measured in degrees Fahrenheit) is a function of how long it has been out of the oven, t (measured in minutes). Thus, we have T = f(t).
(a) Is f'(t) positive or negative? Why?
(b) What are the units for f'(t)?