Look at picture please !! I really need help thank you !

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?

[15 points, algebra 2]simplify the complex fraction and find the restrictions.

Which table represents a linear function? i'll give brainliest to first answer ^'^