Which expression is not equivalent to 6^3/6^6?

1)1/6^2
2)6^-3
3)1/216
4)1/6^3

A20? -foot ladder is placed against a vertical wall of a? building, with the bottom of the ladder standing on level ground 19 feet from the base of the building. how high up the wall does the ladder? reach?

Simplify 6sin θsec θ. choices a) 6 tan θ b) 6 cos θ c) 6 cot θ d) 6

Can someone me with this problem . show your work .