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Define the Newton's Law of Cooling

Newton's Law of Cooling: A cup of hot chocolate has cooled from 92°C to 50°C after 12 min in a room at 22°C.

a) What is the value for k (round to the nearest ten-thousandth)?

b) How long will it take for the drink to cool to 30°C (Round to the nearest tenth of a minute and label your answer?

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