The useful life of a machine bearing depends on its operating temperature, as the following data show. Obtain a functional description of these data. Plot the function and the data on the same plot. Estimate a bearing’s life if it operates at 150°F.

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Temperature (°F) 100 120 140 160 180 200 220 Bearing life (hours X 103) 28 21 15 11 8 6 4