- Calculus help needed?

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If a+b+c=4, ab+ac+bc=6, and abc=3, what is 1/a + 1/b + 1/c? Find all solutions to the following system of nonlinear equations.
(x − 2)^2 + y ^2 = 20
(x + 2)^2 + y^ 2 = 20? Discrete Help ASAP. Please write out symbolic notation.? Verify that M(u,v)=A +u(B-A) +v(C -A) ( A,B,C vectors) is a parametric representation of surface of the triangle A(1,0,0) B(0,-1,2) C(0,2,1)? How many molecules are in 97.8g of FeCl3?