Question: A yam is put in a 200°C oven and heats up according to the differential equation
(dH/dt) = -k(H - 200), for k a positive contant
(a) If the yam is at 20°C when it is put in the oven, solve the differential equation.
(b) Find k using the fact that after 30 minutes the temperature of the yam is 120°C.