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=B y I y is an integer and ≤−4 7^(x+1) + 7^x + 7^(x-1) = 399, what is x? Number Theory: Find the roots of 4x^2+6x+1 in Z11 (could you please explain step by step? THANKS!)? 15.00g of Si reacts with 25.00g of F2 to produce 28.67g of SiF4. Which reactant is the limiting reagent? A partir de qual atividade o homem relacionava-se com o tempo durante o tempo medieval?