Tina wants to install a hot tub in her backyard. The backyard is 15 ft by 40 ft,
and the hot tub will be 7 ft by 7 ft. What is the area of the backyard that will
not be covered by the hot tub?
HELPP

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.