## Functions Modeling Change: A Preparation for Calculus, 5th Edition

$=1$
Use the fact that $\frac{a^m}{a^n}=a^{m-n}$ to simplify the expression to $$=\frac{6^4}{6^4}=6^{4-4}=6^0$$ Any non-zero value to the power $0$ is $1$. Therefore, $6^0=1$.