Your distance from lightning varies directly with the time i…

Your distance from lightning varies directly with the time it takes you to hear thunder. If you hear thunder 16 seconds after you see the lightning, you are about 4 miles from the lightning.   a. Write a direct variation equation for the relationship between time and distance.     b. Estimate how many seconds it would take for the thunder to travel a distance of 4 miles.  

Heart rates and life spans of most mammals are inversely rel…

Heart rates and life spans of most mammals are inversely related. A cat lives for about 30.4 years on average and has a heart rate of 252 beats per minute. a. What is the constant of variation?     b. A hamster has a heart rate of about 317 beats per minute. About how long will ahamster live?     c. An elephant lives for about 70 years. About how many times per minute does anelephant’s heart beat?