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If x^2+y^2 = 6, and x+y=3, then what is x^3+y^3? Find Marginal Cost from total cost function (P^2)A(P)? A partir de qual atividade o homem relacionava-se com o tempo durante o tempo medieval? What do people do when they are fine and everythings good? How do i know what to do now that ive reached my goals? Number Theory: Find the roots of 4x^2+6x+1 in Z11 (could you please explain step by step? THANKS!)?