Question 15 Rewrite the following without an exponent. \[ (-9)^{-1} \] \( \square \)

To rewrite \((-9)^{-1}\) without an exponent, you use the property that raising a number to the power of \(-1\) is equivalent to taking the reciprocal of that number. Therefore, \((-9)^{-1}\) is simply \(\frac{1}{-9}\), or \(-\frac{1}{9}\) when expressed in a more conventional notation. So, you can confidently write: \(-\frac{1}{9}\).