Answer
$\approx - 5.586$
Work Step by Step
$= \log_{0.4} (167)$
Since the base of the $\log$ function is not $10$, then the change of base formula is required before evaluating by calculator:
$= \frac{\log 167}{\log 0.4}$
by GDC / calculator
$= -5.5855...$
$\approx - 5.586$
