SCIENCE Amug of hot chocolate is 90°C at timet = 0. It is surrounded by air at a constant temperature of 20°C. If stirred steadily, its temperature in Celsius after minutes will be y(t) = 20 70(1.071)-. a. Find the temperature of the hot chocolate after 15 minutes. b. Find the temperature of the hot chocolate after 30 minutes. C. The optimum drinking temperature is 60°C. Will the mug of hot chocolate be at or below this temperature after 10 minutes?

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