Hello I need help fast​

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 =

Graph the equationy= x+3[tex]y = x + 3[/tex]

Cd is the perpendicular bisector of both xy and st, and cy=20. find xy.