=== Hand in solutions to: Section 4.4: 2cdf, 4abf, 5, 8, 15, 19 Section 4.5: 1ac, 3, 7, 15, 23 === Suggested problems: (Do not hand in) Section 4.4: 1, 14, 23, 25 Section 4.5: 4, 18, 24