- Convert the rectangular coordinates to polar coordinates with r > 0 and 0 ≤ θ < 2π. 1 (-√2 , -√6)?

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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)? Questions for medicine I could not get it and I need your help? If a+b+c=4, ab+ac+bc=6, and abc=3, what is 1/a + 1/b + 1/c? 7^(x+1) + 7^x + 7^(x-1) = 399, what is x? In one mole of the compound iron(III) oxide,
what fraction of the total number of ions is
the oxygen ion?