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Is (-x^y) always negative? And what about (-x^-y)? The difference between two cities on a map and the actual distance between them. Is the variation inverse or direct? How many grams of NH4Cl must be added to 0.100 L of 0.441 M NH3 to produce a buffer solution with pH= 9.38 ? pKa (NH4Cl) = 9.24? Find the absolute maximum values of the grap f. f(x)=6/x, x is greater or equal to 6? What percentage of U.S blacks are carrying hidden genes for eye colors other than brown?