|
Question 1173937: The maximum heart rate is the highest heart rate achieved during maximal exercise. In general, you get the most benefits and reduce the risks when you exercise within your target heart rate zone. Usually this is when your exercise heart rate (pulse) is about 80 percent of your maximum heart rate. The formula M=0.8(220−A), gives the recommended maximum heart rate, M, in beats per minute, for a person who is A years of age. Determine the age of a person whose target heart rate is 156 beats per minute.
The recommended maximum heart rate is 156 beats per minute
for a person who is _____ years old.
Answer by Theo(13342)   (Show Source):
You can put this solution on YOUR website! the formula is M = .8 * (220 - A).
M is the target heart rate.
A is the age of the person.
when M = 156, the formula becomes 156 = .8 * (220 - A).
simplify this formula to get 156 = 176 - .8 * A.
subtract 156 from both sides of this equation and add .8 * A to both sides of this equation to get .8 * A = 176 - 156
combine like terms to get .8 * A = 20
solve for A to get A = 20 / .8 = 25
confirm by replacing A in the original equation to get:
M = .8 * (220 - 25) = .8 * 195 = 156.
this confirms the solution is correct.
the solution is that the age of the person whose target rate is 156 = 25.
|
|
|
| |
