Answer
$-0.11$
Work Step by Step
Step 1: $\log_{b} \frac{4}{5}$
Step 2: $\log_{b} {4}-\log_{b} {5}$
Step 3: $\log_{b} {2^{2}}-\log_{b} {5}$
Step 4: $2\log_{b} {2}-\log_{b} {5}$
Step 5: Substituting the values of $\log_{b} 2$ and $\log_{b} 5$ in the expression,
Step 6: $2(0.36)-(0.83)$
Step 7: $-0.11$
