3. A hot coffee with temperature 90° C is placed in living room with temperature 26°C. After 5 minutes, the temperature of the coffee becomes 65 C. The equation that governs this problem is given by dT -k(T –T,) dt where T is the temperature of the coffee, T, is the a room temperature and k = 0.0991 is the constant rate. Estimate the coffee's temperature after half an hour.

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