1. The problem statement, all variables and given/known data 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 the rate of 2 feet per second.at that moment how fast is the area of the region between the board, the ground and the wall changing? 2. Relevant equations a=1/2bh 3. The attempt at a solution x^2 + 4^2= 5^2 x=3 da/dt= 1/2b(db/dt)(dh/dt) I think i started it up wrong and I don't know where to go next..