Mathematics, 03.12.2019 23:31 jazminpagan15
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
r = 143 - 0.65a for women
r = 165 - 0.75a 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?
a.
22.5 years old
b.
40 years old
c.
45 years old
d.
42.5 years old
Answers: 1
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