Under today's rules 19 in Roman numerals are considered to be XIX but the Romans themselves would have probably calculated 19 as XVIIII and then simplified it to IXX (-1+20=19) in fact the Latin word for 19 literally means one from twenty.
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19
19x19=361 so you can write the answer in roman numerals as CCCLXI.
10-19-1989 in Roman numerals is X.XIX.MCMLXXXIX
To write 19-11-1987 in Roman numerals, you would write it as XIX-XI-MCMLXXXVII.
Roman numerals for 201 = CCI