If each quadrilateral below is a square find the missing measures

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?

Graph y ≥ -x^2 - 1. click on the graph until the correct graph appears.

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?