Preparing for week 10

Please do the following in preparation for week 10:

• Read chapter 9 (skip 9.4)
• Attempt these problems before the tute: 9.1: 2, 7b, 8 (2, 6b, 7 in first edition); 9.2: 1b, 7; 9.3: 2b;
• Finish the query system and start writing the product sheets