Math
posted by Pam .
A 15foot ladder is placed against a vertical wall of a building, with the bottom of the ladder standing on level ground 12 feet from the base of the building. How high up the wall does the ladder reach?

a^2 + b^2 = c^2
12^2 + b^2 = 15^2
144 + b^2 = 225
b^2 = 225  144
b = 9 
A 19
foot
ladder is placed against a vertical wall of a building, with the bottom of the ladder standing on level ground 13
feet from the base of the building. How high up the wall does the ladder reach?