# 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

## 125 = 176- 0.8A

125 - 176 = - 0.8A

-51 / -0.8 = A

63.75 = A

## solved it myself. for 2021 answer is 51.

176- (0.8 x 51)= 135.2

## Bro “Wicked Ferret” (I don’t know what kind of name that is but whatever) It is not “B” I turned in the test and it was not “B” lucky for me I put in a different answer and got it right SO WHY DONT YOU USE YOUR BRAIN and get the answer right! “CYA” (Don’t give fake information on the internet”

## Take the answer Ms. Sue has and round it (63.75)

you should get 64

## It doesn't make sense!!!

## @soneillon 51 is not even an answer

## :> Good Soup

## 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.

## what about same equation, but with a bpm of 125?

A. 25

B. 39

C. 51

D. 53