- How many ml is needed to prepare 0.1m solution of HCl from a 250 mL 0.35 M solution of HCl?

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If a+b+c=4, ab+ac+bc=6, and abc=3, what is 1/a + 1/b + 1/c? How many edges in a circle? An action potential can be referred as a ¨wave of depolarization¨ down the axon. Explain what you think this means.? Number Theory: Find the roots of 4x^2+6x+1 in Z11 (could you please explain step by step? THANKS!)? Find all solutions to the following system of nonlinear equations.
(x − 2)^2 + y ^2 = 20
(x + 2)^2 + y^ 2 = 20?