A half ( 20 = 1, so 2 to the (0 - 1) = 1/2)
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Three fourths to the negative first power is 1.33333333333
-(3^(-2)) = -0.111111111
5.3 times ten to the negative first power is 0.53
Two and five tenths to the negative third power equals 0.064
A negative power. When something is to the power of negative two, say X it would be 1/X. If something is to the power of negative 3, it would be.... etc