- How is the answer 0.77 m :(?

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Discrete Help ASAP. Please write out symbolic notation.? 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? In one mole of the compound iron(III) oxide,
what fraction of the total number of ions is
the oxygen ion? What set of reaction conditions would favor an SN2 reaction of 2-bromo-bromo-3-mehthylbutane? Diameter of a wheel 80cm. If the wheel rotates through an angle of 200degrees, how many cm does it move? Show steps please!?