The area of a rectangle is given by: A = (w) * (l) Where, w: width l: long Substituting values we have: (54x ^ 9y ^ 8) = (w) * (6x ^ 3y ^ 4) Clearing w we have: w = (54x ^ 9y ^ 8) / (6x ^ 3y ^ 4) Rewriting: w = (9 * x ^ 6y ^ 4) Answer: the length of the rectangle is: w = (9 * x ^ 6y ^ 4)