Aball is thrown from a height of 255 feet with an initial downward velocity of 21 ft/s. the ball's height "h" (in feet) after "t" seconds is given by the following. h = 255 - 21t - 16t^2 how long after the ball is thrown does it hit the ground? round your answer(s) to the nearest hundredth.

Luigi is the first person to finish a 5k race and is standing 13 feet beyond the finish line. another runner, mario, is still running the race and has approximately 24 feet before he reaches the finish line. what is the distance between mario and luigi? explain through words, numbers or pictures how you found the answer.