The GCF of 6, 42, and 12 is:
6.
Because they are using flat nets they may be able to get more boxes per area of cardboard purchased instead of purchasing the boxes and losing some extra cardboard from a cutting or gluing process. the flat nets may also be cheaper to ship or take less area than boxes shipped whole.
X is 12 and y is 15 because of 3,4,5 triangles
