Formula for endpoint of line segment

Can someone pls ! pls answer all. no explanation needed..

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 =

If x is 6, then 7x= a. 13 b. 42 c. 42x d. 76