Posted by ANGEL on Sunday, April 29, 2012 at 1:04am.
C = -42x^2 + 924x + 14112 = 18,100.
-42x^2 + 924x + 14,112 - 18,100 = 0.
-42x^2 + 924x - 3988 = 0.
Use Quad. Formula:
X = 5.89 or 6.
Year = 2006.
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