A ladder 25 feet long is leaning against the wall of a house. the base of the ladder is pulled away from the wall at a rate of 2 feet per second. how fast is the top moving down the wall when the base of the ladder is 7 feet, 15 feet, and 24 feet from the wall? consider the triangle formed by the side of the house, the ladder, and the ground. find the rate at which the area of the triangle is changing when the base of the ladder is 7 feet from the wall.