## Algebra: A Combined Approach (4th Edition)

$-0.11$
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: $-0.11$