Algebra 1 brainilest if correct and reported if not answered ty

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?

The amount of energy it takes to lift a box might be a function of which of the following

Which of the following is the result of expanding the series