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Mathematics 20 Online
OpenStudy (anonymous):

Medical researchers have determined that for exercise to be beneficial, a person’s desirable heart rate, R, in beats per minute, can be approximated by the formulas 4072-01-02-03-00_files/i0230000.jpg for women 4072-01-02-03-00_files/i0230001.jpg for men, where a represents the person’s age. If the desirable heart rate for a man is 135 beats per minute, how old is he?

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