- What if Thor's hammer is so heavy that's why the universe is continuously falling?

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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? Find all solutions to the following system of nonlinear equations.
(x − 2)^2 + y ^2 = 20
(x + 2)^2 + y^ 2 = 20? Number Theory: Find the roots of 4x^2+6x+1 in Z11 (could you please explain step by step? THANKS!)? Find all of the actual roots of the polynomial: x^3 - 2x^2 + 5x + 26 = 0? In one mole of the compound iron(III) oxide,
what fraction of the total number of ions is
the oxygen ion?