The output torque (in J) of a certain engine was measured at various frequencies (in r/min) with the following results. Find a power regression model for these data. Predict the output torque for a frequency of 3500 r/min. Is this interpolation or extrapolation?

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f (r/min) T (J) 500 1000 1500 2000 2500 220 102 77 50 43 3000 30