Additional review problems: 
     Chapter 9:  9,  p.646
     Chapter 12: 10, 19, 24, pp. 845-6
     Chapter 13: 4, 18,  pp. 882-3
     Chapter 14: 33, 48, 65, pp. 976-7
     Chapter 15: 13, 32, pp. 1050-1
     Chapter 16: 10, 17, 39, pp. 1136-7