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If h(t) denotes the number of times a person's heart beats in t minutes, then the pulse rate p beats per minute is given by p = dh/dt

During a workout an athlete has a pulse rate p(t) beats per minute where p(t) = 58 + 10.62*t^(2)*e^(-0.25t)

t minutes after the start of the workout.

How many times does the athlete's heart beat during the first 20 minutes of the workout? Give your answer to the nearest complete heartbeat.

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