a rectangular pool has an area of 640 square feet. the is 12 feet shorter than the width. the length of the pool is feet and the width of the pool is feet.

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.

There is no question, there is just the answer.

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