Heart Rate The heart rate of an athlete while weight training is recorded for 4 minutes. The table lists the heart rate after x minutes. Time (min) 0 1 | 2 3 | 4 Heart rate (bpm) 84 |111| 120 |110| 85 120 110 85 (a) Explain why the data are not linear. (b) Find a quadratic function f that models the data. (c) What is the domain of your function?

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