PLEASE HELP
A 15 foot ladder is resting against a building. The bottom of the ladder is 3 feet from the base of the building.
Question:

a. Draw a picture that represents this situation.
b. Write and solve an equation to find out how high up the the building the ladder rests. Round to the nearest tenth.
c. You are trying to put Christmas lights on your house. The house is 24 feet tall and you have a 25 foot ladder. The base of the ladder must be 3 feet from the base of the house. Is the ladder long enough? What is the shortest ladder you can use?
d. Is it possible for a 20 foot ladder to rest against a building exactly 19 feet above the ground when the base is 3 feet from the building? Why or why not?