- How we do this 2.75 -2 + -5.25?

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Is it true that the oxidation number of an ion is equal to its protons subtracting its electrons? If you started with 3.60g of Copper and reacted it with an excess of nitric acid what mass of copper hydroxide would you expect to recover? ~ x + y + z = 3, x² + y² + z² = 5, x³ + y³ + z³ = 7 ➪ x⁴ + y⁴ + z⁴ = ? Find integers x and y such that 57x+79y=17, and 400 In equal-tempered tuning the frequency (in Hz) of the note one tone above 220 Hz is...?