10-1 is 0.1 or 1/10
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10-2 = 0.01
10-5 = 0.00001
powers are exponents. ten to the zero power=100=1 ten to the first power=101=10 ten to the second power=102=100 etc.
(3)-1 = 1/3
One half to the negative first power is equal to the reciprocal of one half raised to the first power. The reciprocal of one half is two, so (1/2)^(-1) = 1 / (1/2) = 1 * 2 = 2.