xc is 90.
That is, x=10 and c=100. Since x is smaller than c, we subtract rather than add the values. Thus 100-10=90.
The inverse, cx, would be 110 (that is, 100+10).
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Converting between Arabic and Roman Numbers we get,roman numeral CD in standard form is written as 400. CD=400.
3,119
1,511
23 which is 2.3*101 in standard form
XXIII = 23 which is 2.3*101 in standard form