This terrorist hijacked four United States passenger aircrafts. Two crashed into the World Trade Center buildings in New York, one crashed into the pentagon in Washington D.C. and one in Pennsylvania.
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September 11 2001
Tuesday
The date 9/11/2001 would be written as "IX/XI/MMI" in Roman numerals.
the date 9 11 came from the terrorist attack on the world trade center and other various parts of the east coast. It happened on September 11, 2001 the 9 comes from September because it is the 9th month 11 comes from the day it took place
Nine over 11 is already in simplest form.9/11 is in its simplest form.