Part 2: Introduction for Section 10.5 Do the following: 1. 1. Go to page 474 and read the first paragraph of section 10.5. 2. Now go to page 481 and read the "APPENDIX Financial Terms" section on pages 481 and 482.. Do/answer the following: What is the principal? What letter is used to denote the principal? 2. What does the letter F denote? 3. What letter is used to denote the interest rate per period? 4. What mathematical expression is used to determine the interest earned at the end of each interest period (compound period) for compound interest accounts? 5. What mathematical expression is used to find the interest earned for the interest period for both increasing and decreasing annuities?