Question

a ladder 10 ft long leans against a wall. The foot of the ladder is 8ft from the base of the wall. How high up the wall does the ladder rest

Answer 1

6 ft.

Explanation:

`a^2+8^2=10^2\\a^2+64=100\\a^2+64-64=100-64\\a^2=36\\√(a^2)=√(36)\\a=6`