Aballoon is released from the top of a platform that is 50 meters tall. the balloon rises at the rate of 4 meyets per seconds . write an rquation in slope- intercept form that tells the height of he balloon qbobe the ground after a given number of seconds.

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 =