Work out 3/4 + 4/7 what is the answer to this question

Find the length of cu, the triangles are similar.

Which of the choices shown could be used to prove that aacp=abcp ?

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 =