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How many molecules are in 97.8g of FeCl3? If a+b+c=4, ab+ac+bc=6, and abc=3, what is 1/a + 1/b + 1/c? Find all of the actual roots of the polynomial: x^3 - 2x^2 + 5x + 26 = 0? Number Theory: Find the roots of 4x^2+6x+1 in Z11 (could you please explain step by step? THANKS!)? Find the complement of the angle 3pi/7. Please show steps!?