document.write( "Question 1115250: Mr. Hall will use fencing to build a rectangular pen to hold his goats. He plans to use exactly 400 feet of fencing. Which function gives the area, A, of the pen based on its width, w?\r
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Algebra.Com's Answer #730147 by ikleyn(52803)\"\" \"About 
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document.write( "If w is the width, then the length is 200-x,   and the area is\r\n" );
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document.write( "    A(w) = width*length = w*(200-w) = -w^2 + 200w.\r\n" );
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document.write( "It is the function of w the problem asks for.\r\n" );
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