- If z =-1.81 what is the critical value?

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If 7.46g of CrCl3 are dissolved in enough water to make 385 mL of solution, what is the molarity of the resulting solution? 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? If x^2+y^2 = 6, and x+y=3, then what is x^3+y^3? 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)? Find all solutions to the following system of nonlinear equations.
(x − 2)^2 + y ^2 = 20
(x + 2)^2 + y^ 2 = 20?