Running Track You are part of a committee given the responsibility of determining the dimensions of a rectangular practice field of largest area that is surrounded by a running track that is to be exactly 400 m. Practice Field around but which has a semicircle on each end of the field. a) What is the objective function in this situation? A = b) What limits the size of the practice field? What is the constraint equation? ( Hint: set an expression for the track length equal to 400 m.) c) Use the constraint equation to rewrite the objective function in terms of just one variable. A = What is the domain of this function