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Algebra= what expression is equivalent to (6x-8x)^2 x 1/2 +3x^2? Hey guys, I need help with this math problem. Anyone want to help? How many grams of NaOh are contained in 2 L of a 3 M NaOH solution? At 25 °C, what is the hydroxide ion concentration, [OH–], in an aqueous solution with a hydrogen ion concentration of [H ] = 1.3 × 10–4 M? How do you evaluate tan 7pi/4 without using a calculator? I m not sure how to do this math problem please awnser this if you can, thanks!?