Chapter 7 - Exponents and Exponential Functions - 7-1 Zero and Negative Exponents - Practice and Problem-Solving Exercises - Page 417: 29

$\frac{1}{c^5d^7}$

We start with the given expression: $c^{-5}d^{-7}$. The negative exponent rule states that for every nonzero number $a$ and integer $n$, $a^{-n}=\frac{1}{a^n}$. We use the rule to rearrange both terms of the expression as follows: $\frac{1}{c^5d^7}$