Which of the expressions below would you represent a 40% increase in the price of a pair of $50 shoes. explain your answer.
50 x 1.4= 50 + (50 x .4)=

40% of 50 is the same as 0.40 times 50
so the end cost would be orignal cost+increase or 50 times 1+50 times 0.40 or
50(1)+50(0.40)=50(1+0.40)=50(1.40)=50+(50 x .4)

it's correct because of math, (just think about it)

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.