HELP ASAP! THREE MATH QUESTIONS 20 POINTS FOR REWARD

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?

Which expression gives the area of the triangle shown below

Use the data on the dot plot to answer the question. how many people read for more than three hours last week? i'm on a unit test review