Is the x2 supposed to be squared?
You'd want to buy the 4 by 5 and the 11 by 14 because if you times 4 by 3 and 5 by 3, the answer would be 12 by 15 which is the closet or the most similar pair
A measurement is an area of number sense that relates to the quantity of ingredients in recipes
(n^-3)^6=n^-18=1/n^18
the answer is D