- 11 b & c What is the margin of error?

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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? Find the complement of the angle 3pi/7. Please show steps!? An action potential can be referred as a ¨wave of depolarization¨ down the axon. Explain what you think this means.? What set of reaction conditions would favor an SN2 reaction of 2-bromo-bromo-3-mehthylbutane? 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?