WORTH 20 points it’s all I have show all of your work

Part A: [0,2], Part B: [2, 4], Part C: [8,10], Part D: 0 ft

Step-by-step explanation:

Part A:  The time between 0 seconds to 2 seconds is the time when it's increasing. There is no other time like that.

Part B: The graph shows a straight line so therefore it is staying the same.

Part C: The graph shows a sharp decline.

Part D: Starting from the 10th second, the balloon already hit to ground so it would only make sense for it to stay there...

5.000ft

Step-by-step explanation:

Since it fell from 20,000ft, and then I observe that its object fell 15,000, 20,000-15-000 = 5,000, it is 5000ft away from sea level