Math

During exercise, the recommended maximum heart rate in beats per minute is modeled by the formula M=176-0.8A, where M is the maximum heart rate and A is the person’s age. Approximately, at what age would you have a recommended heart rate in beats per minute of 125?
A.52 years
B.64 years
C.67 years<---
D.70 years

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  1. So if m= max heart rate, which you know is 125. Then write the equation as. 125=176-0.8A. Now solve for A to get the persons age. You will need to round to get the answer.

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  2. 52

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  3. I did 175.2 multiplied by 0.7134 then I rounded to get 125. So I don't get how to get the answer!!!

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  4. It doesn't make sense!!!

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  5. Please Help!!

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  6. 125 = 176- 0.8A

    125 - 176 = - 0.8A

    -51 / -0.8 = A

    63.75 = A

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    👩‍🏫
    Ms. Sue
  7. To start with, you're not supposed to multiplying anything. M= 176-0.8A. M+ 0.8A=176. We know what m is, so the equation becomes 125 + 0.8A = 176. We rearrange the equation to be 0.8A= 176-125. Now to get A by itself, we divide both sides by 0.8 so then A= (176-125)/0.8

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  8. 176=220
    125=156

    1

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  9. Take the answer Ms. Sue has and round it (63.75)
    you should get 64

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  10. The answer is "B"
    Why?
    Cuz it's the only logical answer
    USE. YOUR. HEADS. God gave 'em to you for a reason.
    Now, I gotta run
    CYA!!!

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