The recommended heart rate for weight management exercise and improving cardio fitness, in beats per minute, depends on a person 's age and can be represented by the expression 0.7(220-a) what is the recommended heart rate for a 20 year old person?
2 answers:
As per the question, the recommended heart rate (beats per minute) can be represented by the expression 0.7(220-a), i.e. 0.7 * (220-a), where a is the age of the person.
We have to determine the recommended heart rate for a 20-year old person.
Substituting the value 20 for a in the expression
⇒ Recommended heart rate = 0.7 * (220 - 20)
⇒ Recommended heart rate = 0.7 * (200)
⇒ Recommended heart rate = 140 beats per minute
Answer:
Recommended heart rate of a person of age 20 years will be 140 beats per minute.
Step-by-step explanation:
Expression representing the heart rate in terms of beats per minute is = 0.7(220 - a) where a = age of the person.
Now we have to calculate the recommended heart rate for a person having age = 20 years.
Now we put a = 20 in the expression
Heart rate = 0.7(220 - 20)
= 0.7×(200)
= 140 beats per minute
Therefore, recommended heart rate of a person of age 20 years will be 140 beats per minute.
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