Use provided diagram of the isosceles triangle to find the value of the variable x Answers are at the side

How do i do this activity, is appreciated

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 =

See attachment below and find the equivalent of tan(∠qsr)