What is ix xxi?

Answer 1

Ah, it looks like you're trying to write the Roman numeral for 9 and 21. That would be IX and XXI. Isn't it wonderful how numbers can be expressed in different ways? Just like how we can paint the same landscape using different colors and techniques.

Answer 2

ix is 9, and xxi is 21

In Roman Numerals it is IX for 9 and XXI for 21. You see the letters in Roman Numerals have always been upper case (Capitals) for some reason.