- What is the oxidation number for copper(II)?

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Cuantos numeros pares de 3 cifras distintas existen? Hallar la forma simetrica de la ecuacion de la recta 4x-5y-20=0? Write the quadratic function in its vertex form.
y=-10+[(x^2-x)/2]? If X,Y are symmetric random variables,show that E(X/X+Y)=1/2? How many cm in the ears does the holes go in the air before it reaches the brain?