Please Answer Quickly

A ladder that is 24 feet long reaches the window of a building 18 feet above ground. What is the distance from the base of the ladder to the building? Express your answer as a radical

A ladder that is 24 feet long reaches the window of a building 18 feet above ground. What is the distance from the base of the ladder to the building? Express your answer as a radical

ANSWER

i think it is six.

EXPLANATION