During the 18th century Bryan Robinson found that the pulse rate of an animal could be approximated

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During the 18th century Bryan Robinson found that the pulse rate of an animal could be approximated by


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The input x is the length of the animal in inches, and the output f(x) is the approximate number of heart-beats per minute.


(a) Use f to estimate the pulse rates of a 2-foot dog and a 5.5-foot person. 


(b) What length corresponds to a pulse rate of 400 beats per minute?

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