Question

A 35-foot ladder is leaning against a building. The base of the ladder is 21 feet from the base of the wall. How far up the wall does the ladder reach?

Answer 1

Answer:

However, placing the foot of a fifteen foot ladder so far from the wall is terribly unsafe. The basic rule is that the base should be one foot away from the wall for every four feet of its length. Thus, the base of your ladder should be three foot, nine inches from the wall for maximum stability. Height on wall = H =??