Complete the square to find the vertex of this parabola. Please help quick!

Write an inequality and solve each problem.for exercises 11 and 12, interpret the solution.

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 the diagram polygon abcd is a reflection across ef to make polygon a'b'c'd'.