- 3 times what equals 100?

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How many edges in a circle? In one mole of the compound iron(III) oxide,
what fraction of the total number of ions is
the oxygen ion? Find all solutions to the following system of nonlinear equations.
(x − 2)^2 + y ^2 = 20
(x + 2)^2 + y^ 2 = 20? 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)? A partir de qual atividade o homem relacionava-se com o tempo durante o tempo medieval?