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The heart rate of a person can be modeled by the function r(a)=211−0.64a where a is the person's age in years and r(a) is heartbeats per minute. The life span in minutes of a person is modeled by the function s(a)=525,600a . Explain what (r⋅s)(a) represents. (1 point) Responses
the total number of heartbeats in a lifetime of a person who is a years old
the total number of heartbeats in a lifetime of a person who is a minutes old
the heart rate of a person who is a minutes old
the heart rate of a person who is a years old
the total number of heartbeats in a lifetime of a person who is a years old
the total number of heartbeats in a lifetime of a person who is a minutes old
the heart rate of a person who is a minutes old
the heart rate of a person who is a years old
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