The owner of the Rancho Grande has 2944 yd of fencing with which to enclose a rectangular piece of grazing land situated along the straight portion of a river. Assume that fencing is not required along the river (see the figure below). Letting x be the length (in yd) of the side of rectangular piece of land not parallel to the straight portion of a river, find a function f in the variable x giving the area of the enclosed land. f(x) = What is the domain of this function? (Enter your answer using interval notation.)

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