Yes, 8000 is (XIII) and 400 is CD, so 8400 would be (XIII)CD.
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1100
Under today's rules: September-XXVII-MCMLXXX September is the IX month.
I would convert them back into Hindu-Arabic numerals, do the addition and then convert the answer to Roman numerals.
The number 2011 converts to MMXI in Roman numerals.
Not really, since roman numerals don't have units smaller then one.