13 x 2,000 = 26,000
2,000 - 1,989 = 11
13 x 11 = 143
26,000 - 143 = 25,857
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Roman Numeral for: 10=X 13=XIII 1989=MCMLXXXIX (1000=M, 900=CM, 80=LXXX, 9=IX) but if you refer this as October 13, 1989 here's how you write it in Roman Calendar. October= OCT. 13=xiij 1989=MCMLXXXIX Therefore: October 13, 1989 = OCT. xiij MCMLXXXIX
13 July 1989 was a Thursday.
x+13 x+13
x - 7 = 13 Therefore, x = 13 + 7 x = 20
x/13 = 15 x = 15(13) x = 195