Quenching is the process of immersing a hot metal object in a bath for a specified time to obtain certain properties such as hardness. A copper sphere 25 mm in diameter, initially at 300°C, is immersed in a bath at 0°C. The following table gives measurements of the sphere’s temperature versus time. Find a functional description of these data. Plot the function and the data on the same plot.

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Time (s) 1 3 4 5 6 Temperature (°C) 300 150 75 35 12 2