A yam is put into a hot oven, maintained at a constant temperature of 200'C. At time t = 30 minutes, the temperature T of the yam is 120°C and is increasing at an instantaneous rate of 2 degrees per minute. Newton's Law of Cooling (or, in this case, warming) implies that the temperature at time t is given by T (t) = 200 – aebt. Find a and b.

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