Course Content Ex15 (pages 19-21) PARTB Ex36 (pages 34-37) S4 Part B Ex19 (pages 4-23) PARTB Ex16 page 20-21 S4 Part B Ex17 page 20-21 S4 Part B Ex18 (Companion page 19)PART B Ex20 page 22-23 S4 Part B Ex21 page 24-25 S4 Part B
