Heart rates and life spans of most mammals are inversely related. A cat lives for about 15.2 years on

average and has a heart rate of 126 beats per minute.

a. What is the constant of variation?

b. A hamster has a heart rate of about 634 beats per minute. About how long will a hamster live?

c. An elephant lives for about 70 years. About how many times per minute does an elephant’s heart beat?