- Help with geometry question?

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Matematicas? How do I solve this? -6y=6x^2+24x+36 in finding the equation and vertex of the parabola? If both plates are smooth what is the minimum value for theta?as this is a mcq all the answers are in tan^-1.? The pH of a solution is 6.266.
What is the [H3O+]?
What is the [OH-]? Does the sum of (-1)^(n+1)*e^(-n)*n^3 approaching infinity converge or diverge?