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To find the scale factor, we can divide the corresponding sides of the two rectangles.
For the length, the first rectangle has a length of 3" and the second rectangle has a length of 9". Dividing 9 by 3, we get a scale factor of 3.
For the width, the first rectangle has a width of 5" and the second rectangle has a width of 5.4". Dividing 5.4 by 5, we get a scale factor of 1.08.
Therefore, the scale factor used to enlarge the rectangle is 3 in length and 1.08 in width.