- Rational and irrational number between 2 and 2.1?

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Find integers x and y such that 57x+79y=17, and 400 Find integers x and y such that 57x+79y=17, and 400 6g of Mg in 16g of O2 are burnt. Calculate mass of MgO formed.? Is it true that the oxidation number of an ion is equal to its protons subtracting its electrons? ~ x + y + z = 3, x² + y² + z² = 5, x³ + y³ + z³ = 7 ➪ x⁴ + y⁴ + z⁴ = ?