A negative exponent means that factor is on the wrong side of the fraction.
For example, [tex]5^{-11}[/tex] can be written as [tex]\dfrac{5^{-11}}{1}[/tex] and to get rid of that negative exponent, the [tex]5^{-11}[/tex] gets moved to the bottom and the exponent becomes positive.
[tex]5^{-11} = \dfrac{1}{5^{11}}[/tex]
And if the exponent is negative in the bottom, then you move that factor to the top:
[tex]\dfrac{1}{y^{-7}} = \dfrac{y^7}{1}[/tex] and we just write that as [tex]y^7[/tex], since the "over 1" isn't needed.
The formatting of your question leaves me guessing a bit, but I think your original expression was [tex]11^{-8}[/tex]. Based on what we just talked about above, how would you rewrite that with a positive exponent?
