Divide the area by the width (or the number that the problem gave you). So 635.4/18. This will give you the length because of the formula length x width = area (formula for the area of a rectangle). So in this case the answer should be 35.3
If you want to check your work just multiply the width by the length. 35.3x18= 635.4
The length of Marty's rectangular yard is 35.3 feet, calculated using the area and width provided. We verify the correctness by checking that length multiplied by width equals the area. Thus, the answer checks out at 635.4 square feet.
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