X.XXVIII.MCMXCIV
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To write the number 9 in Roman numerals, you would use the symbol 'IX'. This is made by combining the Roman numeral for 1, 'I', and the Roman numeral for 10, 'X', subtracting 1 from 10.
The date 07-10-1994 in Roman numerals would be VII.X.MCMXCIV
CCXXIX is the number 229 in roman numeral. To write 9 we have to do IX that is 10-1.
31 in Roman numerals is XXXI which is equivalent to: 10+10+10+1 = 31