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Find integers x and y such that 57x+79y=17, and 400 Is it true that the oxidation number of an ion is equal to its protons subtracting its electrons? I'm trying to find a compound that contains an alkaline earth metal and a polytomic ion and then finding its molar mass.? Differentiate(t) = (cos^3 t+ 3cost +7)^9? In equal-tempered tuning the frequency (in Hz) of the note one tone above 220 Hz is...?