A football is kicked into the air. Its height above the ground changes according to the equation y --16x2 + 80x +3, where x = time in seconds and ) = height in feet. The ball reaches a height of 67 feet twice: once on the way up and once on the way down. How much time does the ball spend at or above a height of 67 feet?

Anew obstacle course is home to several new types of challenging obstacles. one such obstacle is traversing a 15-stair staircase. to make it more challenging, the stairs are not uniformly spaced. rather, the vertical space between consecutive stairs for the first 10 stairs is 113 feet and the vertical space for the last 5 stairs is 134 feet. what is the total vertical distance traveled ascending and descending the entire 15-stair staircase?