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Target Heart Rate (Refer to the preceding exercise.)
A target heart rate T that is half a person’s maximum
heart rate is given by T=110-1/2A, where A
is a person’s age.
(a) What is T for a person 30 years old? 50 years old?
(b) Sketch a graph of the system of inequalities.
Assume that A is between 20 and 60.
(c) Interpret your graph.

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