## College Algebra (10th Edition)

$\approx -3.880$
RECALL: The change-of-base formula for logarithms: $\log_a{b}=\dfrac{\log{b}}{\log{a}}$ Use a calculator and the formula above to obtain: $\log_{1/3}{71} = \dfrac{\log{71}}{\log{(1/3)}} \approx -3.880$