A voltage-divider bias circuit has V_{CC} = 22 V, R₁ = 39 kΩ, R₂ = 3.9 kΩ, R_{C} = 10 kΩ, R_{E} = 1.5 kΩ and β = 140 (V_{BE} = 0.7 V). Find I_{C} in mA and V_{CE} in V by (a, b) the exact (Thevenin) method and (c, d) the approximate method.