A rectangle has an area of 40 square units. The length is 6 units greater than the width.

The rectangle’s dimensions must multiply to 40, and the length must be 6 units more than the width. For 10 by 4, the area is 10 × 4 = 40 and the difference is 10 − 4 = 6. So the correct choice is 10 by 4.

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