21: Answer Key Last updated Feb 28, 2025 Save as PDF 20.1: Appendix A- Methods 21.1: Chapter 1 Page ID237072 OpenStaxOpenStax ( \newcommand{\kernel}{\mathrm{null}\,}\) 21.1: Chapter 121.2: Chapter 221.3: Chapter 321.4: Chapter 421.5: Chapter 521.6: Chapter 621.7: Chapter 721.8: Chapter 821.9: Chapter 921.10: Chapter 1021.11: Chapter 1121.12: Chapter 1221.13: Chapter 1321.14: Chapter 1421.15: Chapter 1521.16: Chapter 1621.17: Chapter 1721.18: Chapter 1821.19: Chapter 19