Answer:
It would be 17 feet.
Explanation:
So to do this, there is a right triangle being made with the height of the water slide and its base (length). With this, the Pythagorean Theorem can be used to find the hypotenuse of these lengths by the equation:
a^2 + b^2 = c^2
So by plugging in the given legs of the triangle, the answer can be found.
15^2 + 8^2 = c^2
225 + 64 = c^2
289 = c^2
c = 17