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What is a Ramachandran plot? What are the parameters shown on a Ramachandran plot? Calculate the concentration of potassium ions in solution if 20.0mL of K2SO4 is mixed with 35.0mL of KCl.? Find an explicit quadratic polynomial =ax^2 +bx + c that has three roots.? Math question, what's x^2= 16/36? How do you solve the x-value of f(x)=-x^2 +2x+3 by Quadratic function?