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3 August, 00:53

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 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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  1. 3 August, 02:42
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    40 years old

    Step-by-step explanation:

    R, in beats per minute, can be approximated by the formulas, where a represents the person's age.

    R = 143 - 0.65a for women

    R = 165 - 0.75a for men,
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