When you exercise, your pulse rate rises. Recommended pulse rates vary with age and physical condition. For vigorous exercise such as jogging, the inequality 0.7(220 – a) ≤ R ≤ 0.85 (220 – a) gives a target range for pulse rate, R, (in beats per minute) based on age, a, (in years).
In what range should your pulse rate be when you are jogging? The age is 14 years old.

Show work here:

Question

When you exercise, your pulse rate rises.  Recommended pulse rates vary with age and physical condition.  For vigorous exercise such as jogging, the inequality 0.7(220 – a) ≤ R ≤ 0.85 (220 – a) gives a target range for pulse rate, R, (in beats per minute) based on age, a, (in years). 
 In what range should your pulse rate be when you are jogging? The age is 14 years old.

Show work here:

anonymous · Answer

I believe the answer is 140≤R≤175.1

anonymous · Answer

http://www.algebra.com/algebra/homework/Inequalities.faq.question.56817.html http://openstudy.com/study?version=feed:get-live-help&referrer=mathematics&domain=none#/updates/5261a6bde4b0c23cd54aec12 look at that ^^ you should be able to figure it out from there.

anonymous · Answer

Thanks

anonymous · Answer

Is my answer write though?