How can I put this into an equation?

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 center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.

Plot a point at the y-intercept of the following function on the provided graph. 3y=-5x+7 20 points