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9. A small body with a temperature of 50 C is placed in a room with air temperature 20C. The formula below is used to

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9. A small body with a temperature of 50 C is placed in a room with air temperature 20"C. The formula below is used to predict the temperature, C, of the body t minutes later: C =30e-0.02031 + 20 Find the instantaneous rate of change in the temperature of the body at the time when it has cooled to 45 C. [10]

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