Heart rates and life spans of most mammals can be modeledusing inverse variation. The

Chapter 3, Problem 83

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Heart rates and life spans of most mammals can be modeledusing inverse variation. The bar graph shows the averageheart rate and the average life span of five mammals.a. A mammals average life span, L, in years, varies inverselyas its average heart rate, R, in beats per minute. Use thedata shown for horses to write the equation that modelsthis relationship.b. Is the inverse variation equation in part (a) an exactmodel or an approximate model for the data shown forlions?c. Elephants have an average heart rate of 27 beatsperminute. Determine their average life span.

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