x-n is the same as 1/ xn.
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103 = 1000 10-3 = 0.001 or 1/1000
Its very simple...25 /(1/64) = 25 * 64 = 1600
To raise something by the power of negative one, take the reciprocal of the number. In this instance, -3/4-1 = -4/3 or negative four thirds. Expressed as a decimal, this is equal to -1.3 recurring (that is, -1.3333...)
If the power is a positive integer, you can use repeated multiplication. For example: 34 = 3 x 3 x 3 x 3
That means that you raise 3 to some power, that is usually understood to be an integer, and sometimes only positive: 30, 31, 32, 33, 3-1, 3-2, etc.