'T' means 'time' ie time of a particular event; therefore, T minus two hours to, say, a shuttle launch, means two hours to the time of the projected liftoff of the spacecraft.
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Two thirds minus two ninths is 4 ninths. Two thirds is 6 ninths. 6 ninths minus 2 ninths is 4 ninths.
Yes, minus two is larger than minus four.
Two and two fifths. Five minus two and three fifths = two and two fifths
Negative Two.
The answer is 2/3 minus 2/5 = 4/15