- Is glass a superconductor? Referring to fiber optics networks?

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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? If a+b+c=4, ab+ac+bc=6, and abc=3, what is 1/a + 1/b + 1/c? 0.8 litres water is how many cups? 7^(x+1) + 7^x + 7^(x-1) = 399, what is x? Number Theory: Find the roots of 4x^2+6x+1 in Z11 (could you please explain step by step? THANKS!)?