Mathematics Test—No Calculator - College Board

Since the numerator and denominator of the fraction 2 to the power 3 x, over 2 to the power . y. have a common base, this expression can be rewritten as 2 to the 3 x. minus . y. power. It is given that 3 x minus . y. equals 12 so one can substitute 12 for the exponent, 3 x. minus . y, giving that the expression the fraction 8 to the power . x ................
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