A and b please

5. (5 points) A board 5 feet long slides down a wall. At the instant the bottom end is 4 feet from the wall, the other end is moving down the wall at a rate of 2 feet per second. At that moment, (a) How fast is the bottom end sliding along the ground? wall 1 2 ft/s ladder 5 feet 4 feet (b) How fast is the area of the region between the board, ground, and wall changing