Say i buy a tv for $1,200,but i buy it for a discount of 35%. how much do i pay?

1200 x .35 = 420
1200 - 420 = 780
$780 

$780 you find .35 multiplied by 1,200 to get 420. You then take 420 away from the original 1,200 to get the answer of $780.

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.