The temperature of a certain cup of coffee 10 minutes after it was poured was 120 degrees Fahrenheit...

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The temperature of a certain cup of coffee 10 minutes after it was poured was 120 degrees Fahrenheit. If the temperature F of the coffee t minutes after it was poured can be determined by the formula $F=120\cdot 2^{-at} + 60$, where F is in degrees Fahrenheit and a is a constant. Then the temperature of the coffee 30 minutes after it was poured was how many degrees Fahrenheit?

A. 65
B. 75
C. 80
D. 85
E. 90

OA B

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