9. manny drove 72 miles in 1½ hours. if he drives at the same average speed, how many miles can he go in 4 hours?

72\1.5=x•4=how many miles he can go in 4 hours

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.