A 10-At ladder is leaning against a house when its base starts to slide away By the time the base is 8 it from the house, the base is moving away at the rate of 18 ft/sec. a. What is the rate of change of the height of the top of the ladder? b. At what rate is the area of the triangle formed by the ladder, wall, and ground changing then? C. At what rate is the angle between the ladder and the ground changing then? a. The rate of change of the height of the top of the ladder is fu/sec (Simplify your answer.) b. The area is changing at nt?/sec. (Simplify your answer.) c. The angle is changing at |rad/sec (Simplify your answer.)