## Precalculus: Mathematics for Calculus, 7th Edition

$\log_4 16^{100}$ Use the Third Law of Logarithms 100$\log_4 16$ 100$\log_4 4^2$ Use the Third Law of Logarithms again 100$\times$2$\log_4 4$ 100$\times$2$\times$1 (since $\log_x x$ = 1) =200