## Algebra: A Combined Approach (4th Edition)

$\frac{1}{8}$
Step 1: $2^{-3}$ Step 2: According to the negative exponent rule, $2^{-3}=\frac{1}{2^{3}}$. Step 3: Solving further, $\frac{1}{2^{3}}=\frac{1}{8}$. Step 4: Therefore, the final answer is $\frac{1}{8}$.