IB Mathematics Applications and Interpretation Quiz
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A cup of coffee with an initial temperature of 95°C is left to cool in a room with a constant temperature of 20°C. The temperature, T, of the coffee after t minutes is modelled by T(t)=20+75e−kt. After 5 minutes, the temperature is 60°C. Find the time it takes for the coffee to cool to 30°C.
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