Volume and pressure are inverse to each other -- so the more pressure, the less volume, and vice versa. Think of it like this: if you were squished into a tiny room, there would be a lot of pressure on you, and not a lot of volume to move in!
You can also think of it numerically. The higher the V in that equation (the higher the denominator) the lower the p in the equation.
Let each side perpendicular to the river be "x".Then the side parallel to the river is "400-2x". The formula for Area = width*length A(x) = x(400-2x) A(x) = 400x - 2x^2 You have a quadratic with a = -2 and b = 400 Maximum Area occurs where x = -b/2a = -400/(2*-2) = 100 ft. (width) length = 400-2x = 400-2*100 = 200 ft (length)
