Find the lengrh of CD

Two parallel lines are crossed by a transversal.what is value of x

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 =

Aquadratic equation in standard from is written ax^2= bx+c, where a,b and c are real numbers and a is not zero?