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In one mole of the compound iron(III) oxide,
what fraction of the total number of ions is
the oxygen ion? Could someone help me with these math problems? I can't figure them out. Solve the linear equation;
x+2y=15
y=-2x+0 9x-12y=-3
-12x+16y=4? What is cycle time for astm? Find all solutions to the following system of nonlinear equations.
(x − 2)^2 + y ^2 = 20
(x + 2)^2 + y^ 2 = 20? If a+b+c=4, ab+ac+bc=6, and abc=3, what is 1/a + 1/b + 1/c?