Whenever you see a negative exponent (the negative 2nd power), take the reciprocal of the answer (put one over it):
x-y = 1/xy
So:
9-2 = 1/92 = 1/81 = 0.01234567901
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9 to the negative 9th power is 2.58117479e-9
9-2 = 1/92 = 1/81
5.3965953e-16
Negative 9 to the negative 2nd power (-9-2) = 0.012345679 (repeating).
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