In the new revised version you see now, - new phrasing clarifies the form required for answer (a), and a sign error was corrected in the answer-checker (the text of the problem clearly requires dt/ dT <0 for the time interval of interest). Newton's Law of Cooling states that the rate at which an object cools is proportional to the difference in temperature between the object and the surrounding medium. Suppose an object is taken from an oven at 148∘ C and left to cool in a room at 23∘ After 0.7 hours, the object's temperature is 90∘ Let T(t) denote the object's temperature after t hours. Complete the differential equation that describes this situation by entering a suitable expression ?