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?
A. 25 years
B. 39 years
C. 51 years
D. 53 years
First, we can set up the equation using the given information:
135 = 176 - 0.8A
Subtracting 135 from both sides, we get:
41 = 0.8A
Dividing both sides by 0.8, we get:
A = 51.25
Rounding down to the nearest integer, we get 51. Therefore, the answer is C. 51 years.