T is for TIME, and the minus is the amount of time left before takeoff. If you say T minus two, and TIME is 0830, it is 0828. "Holding" is another term meaning the countdown has stalled usually due to a technical problem. T minus 2 and holding in this case would mean 0828 and countdown has paused until problem is resolved.
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8 - (9 - t)
28 t2 - 17 t - 3 = (7t + 1) x (4t - 3)
(t + 3)(t - 15)Ask yourself, what factors of - 45 add up to - 12 ?t = - 3t = 15
(t - 3)(t^2 + 3t + 9)
5m-t/7