1. The problem statement, all variables and given/known data Torricelli’s law says that if you drain a tank like the one in the figure shown, the rate y at which water runs out is a constant times the square root of the water’s depth x. The constant depends on the size and shape of the exit valve. http://imageupload.org/thumb/thumb_136882.jpg Suppose that for a certain tank. You are trying to maintain a fairly constant exit rate by adding water to the tank with a hose from time to time. How deep must you keep the water if you want to maintain the exit rate a. within 5.7 L/min of the rate y0=28.3L/min b. within 2.8 L/min of the rate y0=28.3L/min 2. Relevant equations 3. The attempt at a solution I could not understand neither the question nor the method i should use. Should it be done via epsilon-delta method? Or simply by differentiating ?