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What was before the big bang? Was there something or was there nothing? How to simplify (25-u^2) and also put u before the number? Hp many European countries have made hybrid vehicles mandatory for manufacturers with no exceptions? The non-permissible value(s) for the rational expression (2x^2-x-1)/ (4x^2-3x-1)? Calculate the concentration of a NaOH solution if 20.0 mL of the solution is needed to neutralize 23.0 mL of a 0.312 M HCl solution?