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If a+b+c=4, ab+ac+bc=6, and abc=3, what is 1/a + 1/b + 1/c? What set of reaction conditions would favor an SN2 reaction of 2-bromo-bromo-3-mehthylbutane? 15.00g of Si reacts with 25.00g of F2 to produce 28.67g of SiF4. Which reactant is the limiting reagent? Make a conjecture about the next item in the sequence.1, -4, 9, -16,? Diameter of a wheel 80cm. If the wheel rotates through an angle of 200degrees, how many cm does it move? Show steps please!?