We know that for a given function F(X) and it's inverse i.e. the composition of both the results in a identity function no matter what the order is such that:
Also, for a inverse of a given function the domain and the range gets interchange.
i.e. the domain of the function becomes the range of it's inverse and the range of the function becomes the domain of it's inverse.
From the question, we are informed that a diving board is 10 feet above a pool. Since the ladder is 5 feet away from the base of the diving board, to calculate how tall is the ladder is, we subtract -5 from 10. This will be: