We can use trigonometry to find the height of the water slide.
Let's call the height of the starting point of the water slide "h". We can then use the tangent function:
tan(49°) = h / 89
We can solve for "h" by multiplying both sides by 89:
h = 89 * tan(49°)
Using a calculator, we get:
h ≈ 94.29 feet
Therefore, the starting point of the water slide is about 94.29 feet above the ground.