• anonymous
Doctors use the term maximum heart rate (MHR) when referring to the quantity found by starting with 220 beats per minute and subtracting 1 beat per minute for each year of a person’s age. Doctors recommend exercising 3 or 4 times each week for at least 20 minutes with your heart rate increased from its resting heart rate (RHR) to its training heart rate (THR), where THR = RHR + .65(MHR – RHR) Which of the following is closest to the THR of a 43-year-old person whose RHR is 54 beats per minute? A. 197 B. 169 C. 162 D. 134 E. 80
  • schrodinger
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  • anonymous
first find the MHR which is given to you as 220 - age age = 43 so 220 - 43 = 177 MHR = 177 the RHR is given as 54 now substitute THR = 54 + .65(177 - 54) punch those into a scientific calculator youll get 133.95 it says clostest so round off youll get 134 so ans is D

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