Aladder leans against a building. the foot of the ladder is 6 feet from the building. the ladder reaches a height of 14 feet on the building. find the length of the ladder to the nearest foot.

Use the Pythagorean Theorem
6 feet and 14 feet are the "legs" and the ladder length is the hypotenuse.
hypotenuse^2 = 6^2 + 14^2
hypotenuse^2 = 36 + 196
hypotenuse^2 = 232
hypotenuse = 15.2315462117
ladder length = 15 feet

Source:
http://www.1728.org/pythgorn.htm

There are 15 rings on the laddey