Margaret gave the waitress $50 for 6 burgers. She received $9.80 in change. Each burger cost the same amount. How much was each burger?

Answer = $6.70
Explanation - you have to subtract 9.80 from 50 first which equals 40.2. You then have to divide 40.2 by 6 to figure out how much each burger cost, which equals 6.7. Therefore each burger cost a total of $6.7

$6.70
explanation - subtract $9.80 from the $50 she paid in total which leaves $40.2 and then you divide $40.2 by 6 and you get your answer, $6.70

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.

B. because the 7 represents "seven times", x represents "a number", 12 represents "plus twelve", and -4 represents "minus four"