11. A hot air balloon is secured to the ground by a stake and a 200 foot
rope. From the balloon, the angle of
depression is 36º. Find the height of
the balloon to the nearest foot.

36x2 + 49y2 = 1,764 the foci are located at: (-√13, 0) and (√13,0) (0, -√13) and (0,√13) (-1, 0) and (1, 0)edit: the answer is (- the square root of 13, 0) and (the square root of 13, 0)