Heart Rate The table shows a person's heart rate after exercise has stopped. (a) Find values for the constants a, h, and k so that the formula f(x) = a(x – h} + k models the data, where x represents time and 0 s IS 4. Time (min)| 0 2 4 Heart rate (bpm) 154 | 106 90 (b) Evaluate f(1) and interpret the result. (c) Estimate the times when the heart rate was from 115 to 125 beats per minute.

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