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Does anyone know what TCB equal? Evaluate the function for x=-2, x = 0, and x = 9. f(x) = 5x^2 - 2x + 8? Dude Lorentz theory of metals? How manually divide 109 by 10? A reaction has an equilibrium constant of 6.6×103 at 298 K. At 702 K , the equilibrium constant is 0.72. Find ΔHorxn for the reaction.?