A pot of boiling water with a temperature of 100C is set in a room with a

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A pot of boiling water with a temperature of 100°C is set in a room with a temperature of 20°C. The temperature T of the water after x hours is given by T(x) = 20 + 80e-x

(a) Estimate the temperature of the water after 1 hour. 

(b) How long did it take the water to cool to 60°C?

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