Pls help quick, thanks

Problem melissa is her dad build a walkway in their backyard. the walkway will be 54 feet long and 1.5 feet wide. the local hardware store sells tiles which are 1.5 by 1.5 feet and come in boxes of 12. how many boxes of tiles do they need?

X+y=-4 x-y=2 use elimination with adding and subtraction

18 16 11 45 33 11 33 14 18 11 what is the mode for this data set