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The temperature of a certain cup of coffee 10 minutes after it was poured was 120 degrees Fahrenhheit. If the temperature F of the coffee T minutes after it was poured can be determined by the formula F = 120 (2^(-aT)) + 60, where F is in degrees fahrenheit and a is a constant, then he temperature of the coffee 30 minutes after it was poured was how many degrees fahrenheit?
Impossible is nothing