A rectangular hole is to be cut in a wall for a vent. If the perimeter of the hole is 104 in. and the length of the diagonal is a​ minimum, what are the dimensions of the​ hole?

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.