How would I write the data as ordered pairs? Would it be (1,31), (3,34)… ect?

U.S size
1 , 3, 5, 7, 9, 11
European size
31, 34, 36, 39, 41, 44

that's the way I'd do it.

Of course, the reverse ordering would also be a way to do it.

Your way gives you the European size for a given US size.

Ok thank you kindly!!

To write the data as ordered pairs, you can pair each U.S size with its corresponding European size in parentheses.

Using the given data:

U.S size: 1, 3, 5, 7, 9, 11
European size: 31, 34, 36, 39, 41, 44

The ordered pairs would be:

(1, 31), (3, 34), (5, 36), (7, 39), (9, 41), (11, 44)

Each ordered pair represents a U.S size and its corresponding European size.