I need help with these fast

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?

Ten times the square of a non-zero number is eqaul to ninety times the number

The midpoints of the sides of the large square are joined to form a smaller square. what is the area of the smaller square