A thermometer reading is 60oF at 3:00AM and a Civil Engineering student takes it outside where the air temperature is 20oF. At 3:10, the reading is 30oF. At 3:15, the thermometer is taken back indoor where the thermometer is 60oF. What is the thermometer reading at 3:20AM. A. The value of the constant of proportionality is _____________. B. The temperature of the thermometer at any time t is given by

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A thermometer reading is 60oF at 3:00AM and a Civil Engineering student takes it outside where the air temperature is 20oF. At 3:10, the reading is 30oF. At 3:15, the thermometer is taken back indoor where the thermometer is 60oF. What is the thermometer reading at 3:20AM.

A. The value of the constant of proportionality is _____________.
B. The temperature of the thermometer at any time t is given by ____________.

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