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Because of the way powers with negative exponents are defined, that is the same as 1 / 42.
2^4 * 2^3 16 * 8 128
2-4 = 0.0625
2/4 raised to the second power equals 0.25
2x2x2x2 or 2 to the power 4
4^(-2) = 1/4^2 = 1/16.