To get something to a negative power, first you must put it on the opposite side of the fraction it would be on currently. Also, when you do this, you switch the negative exponent to a positive exponent.
13^-2
1
=
1
13^2
Solve.
1
169
=
13^-2
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-15
-(3^(-2)) = -0.111111111
negative twenty-seven
Mathematically, the opposite of a number would be its negative. Rhetorically, the opposite of thirteen is "not thirteen".
Two and five tenths to the negative third power equals 0.064