Please help me solve this problem to get full grade

Problem 7 (10 points) A 10 feet sliding ladder is leaning against a house when its base starts to slide away .By the time its base is 8 from the house , the base is moving at the rate of 6 ft/sec. Wall Ladder Ground 1. How Fast is the top of the ladder sliding down the wall then? 2. At what rate is the area of the triangle formed by the ladder wall and ground changing then? 3. At what rate is the angle 0 between the ground and the ladder changing