Point B is on line segment AC. Given AC = 2x + 7, BC = x, and AB = 5x – 9, determine the numerical length of AB.

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.