- WHAT IS AN INDICATOR?

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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? How many molecules are in 97.8g of FeCl3? Problem involving math induction! If m and n are distinct real numbers, prove that (m+2)^2 = (n+2)^2 if and only if x+y=-4? Is there a musical term for two independent, non-complementary, parts being played simultaneously? What about for three parts? If a+b+c=4, ab+ac+bc=6, and abc=3, what is 1/a + 1/b + 1/c?