Have you ever thought about the number of times your heart beats in a life time? consider the average life span of 75 years and the average heart beat of 1.2 heartbeats per second. estimate, using scientific notation, the number of times your heart will beat in your lifetime.

25 ! the line of best fit is h = 5a + 86. predict the height at age 16. show your work.

Can someone check if i did this correct. it’s number 4 if you’re wondering.

Aball is thrown from a height of 139 feet with an initial downward velocity of 15 ft/s. the ball's height h (in feet) after t seconds is given by the following. h=139-15t-16t^2 how long after the ball is thrown does it hit the ground? round your answer(s) to the nearest hundredth. (if there is more than one answer, use the "or" button.) t =