In order:
IX, XVIII, X
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The date 9-18-2008 in Roman numerals is IX-XVIII-MMVIII.
9,000,000,000 = ((((M))))IX in Roman numerals ((((M))))IX = 10*10*10*1000*1000*9 = 9,000,000,000
No, it is 9 XI is 11 in Roman numerals (10+1=11)
It is already in Roman numerals as IX which means 10-1 = 9
IX-XVIII-MMX