You pay $1 to rent a movie plus an additional $0.50 per day until you return the movie. your friend pays $1.25 per day to rent a movie. make tables showing the costs to rent a movie up to 5 days.]

Day          You                                               Your friend
1               $1 + $0.50  x 1 = $1.50                 $1.25 x 1 = $1.25
2               $1 + $0.50  x 2 = $2.0                   $1.25 x 2 = $2.50
3               $1 + $0.50  x 3 = $2.50                 $1.25 x 3 = $3.75
4               $1 + $0.50  x 4 = $3.00                 $1.25 x 4 = $5.00
5               $1 + $0.50  x 5 = $3.50                 $1.25 x 5 = $6.25     

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.