10. The rate of heart beats and life spans of most mammals are inversely related. A cat lives for about 15.2 years
on average and has a heart beat rate of 126 beats per minute.
(i) What is the constant of variation?
(ii) An elephant lives for about 70 years. About how many times per minute does an elephant's heart beat?
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Answer:
An elephant breathes 30 times per minute .
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