a retailer that sells school supplies has to pay a manufacturer $350 to make a mold for a new pencil case and $0.70 to produce each case. The retailer charges its customers $0.99 for each pencil case.

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.

hope it is correct if not i'm srry i tried to