10^(-1) put it into a fraction
10^(-1) = 1/(10^1) = 1/10
Also: 3^(-1) = 1/3
and: 4^(-2) = 1/(4^2) = 1/16
2^(-5) = 1/(2^5) = 1/32
If you look here you will find your answer.
http://web2.0calc.com/questions/indices-especially-negative-indices
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