When an object is moved from one environment to another, its temperature T changes at a rate given by dT / dt = kCekt where t is the time in the new environment (in hours), C is the temperature difference (old - new) between the two environments, and k is a constant. If the temperature of the object (and the old environment) is 70°F, and C = - 10°F, what function describes the temperature T of the object t hours after it is moved?