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 135?
25 years 39 years 51 years 53 years
We can solve the equation M = 176 – 0.8A for A by substituting M = 135 and solving for A:
135 = 176 - 0.8A
0.8A = 176 - 135
0.8A = 41
A = 41 / 0.8
A ≈ 51.25
Therefore, at approximately 51 years of age, a person would have a recommended heart rate of 135 beats per minute during exercise. So the answer is 51 years.