1.6x10 to the -3rd or 1 over neg 625.
1 over 3 to the negative 2nd power is 9
It is equivalent to 1 over 5 to the power of 5, or 1 over 3125.
-4-3 = -1/64
1/216
1/8 or .125
8-3 = 1/83 = 1/512
3-3 = 1/33 = 1/27
That's the same as 1 divided by (x to the power 3).
10-3 = 1/103 = 0.001
That is the definition of negative powers.
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