The sum of the measure of the interior angles of polygon is 1440 classify the polygon by the number of slides

It would have 10 sides so the polygon would be decagon

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.