- System of equations by elimination for 4x+12y=24 and 2x+6y=12?

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If the Kb of a weak base is 3.6 × 10-6, what is the pH of a 0.36 M solution of this base? Why should I trust scientists? Don't they make mistakes just like every other person? Amplitude of -sin(1/2x)-√3cos(1/2x) ? Conocen profesionales de la salud que realicen suicidios asistidos en Buenos Aires? If the Ka of a monoprotic weak acid is 7.2 × 10-6, what is the pH of a 0.22 M solution of this acid?