Will mark ya brainliest for the right answer!

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?

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?

Solve the equation by completing the square. x^2+2x=17