Your heart rate rises when you exercise.
during aerobic exercise, your heart rate
should be at least 0.7(220 - a), but no
more than 0.85(220 - a), where a is your
age. find the target range if you are 14.
years old.

The target range is , when you are 14 years old.

Step-by-step explanation:

We are given the following information in the question:

Lowest range of heart range:

Maximum heart range:

where a is the age of person.

Let x denote the heart rate of a person.

Then, according to the question:

We have to find a range of heart rate when the age is 14.

Putting a = 14, we have:

Hence, the target range is , when you are 14 years old.

y=x+9

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step-by-step explanation: