Chapter 2 - Section 2.5 - Powers of 10 - Exercises - Page 122: 8

$\frac{1}{10^6}$

To raise a power to a power, multiply the exponents. $(10^3)^{-2}\longrightarrow$ to raise a power to a power, multiply the exponents $=10^{-6}\longrightarrow$ express the result using a positive exponent $=\frac{1}{10^6}$