A summer camp has 320320 ft of float line with which to rope off three adjacent rectangular areas of a lake for swimming​ lessons, one for each of three levels of swimming ability. A beach forms one side of the swimming areas. Suppose that the width of each area is x feet. Answer parts​ a) and​ b) xx xx xx xx ​a) Express the total area of the three swimming areas as a function of x.   ​A(x)equals=nothing ​(Simplify your​ answer.)   ​b) Find the domain of the function.   The domain of the function is nothing. ​(Type your answer in interval​ notation.)

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