Joey is a skydiver who deploys his parachute when he is 13,000 feet above the ground. The landing zone is 1300 feet from the directly below where the chute was opened. His distance above the ground is decreasing at 10 miles per hour. His horizontal distance from the landing zone is decreasing at 1 mile per hour. A.) Joey opens his parachute and begins to descend toward the landing zone at a rate of 10.5 miles per hour. After 2.5 minutes, he is 10,854 feet from the landing zone, and his vertical distance above the ground is 10,800 feet. How many feet was Joey from the landing zone when he began his descent?