A paper airplane is thrown from the top of a tall building the height of the paper airplane above the ground can be found using the function y= -1.5 x + 60 where x is the time in second the airplane has been in the air. How many seconds does it take for the paper airplane to reach the ground? A. 60 seconds
B. 40 Seconds
C. 6 Seconds
D. 4 Seconds

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?