9.2/9.3 Quiz Review FORMULAS: Name: ________________________ Per: _____ Arithmetic Sequence Geometric Sequence an a1 (n 1)d an a1 r n 1 Example: SYMBOLS: Example: an = a1 = n= d= r= For each of the following sequences, determine if it is arithmetic or geometric. If it is arithmetic, state the common difference. If it is geometric, state the common ratio. 1. 3, 12, 21, … arithmetic: d = ______ geometric: r = _______ neither 2. 3, -12, 48, … arithmetic: d = ______ geometric: r = _______ neither 3. 3, 9, 18, … arithmetic: d = ______ geometric: r = _______ neither 4. 1 1 , ,1,... 4 2 arithmetic: d = ______ geometric: r = _______ neither ---------------------------------------------------------------------------------------------------------------------------------------------------------5. What is the 22nd term of the arithmetic sequence with a1 3 and d 4 ? 6. What is the 100th term of the arithmetic sequence that begins -5, -8, -11, …. ? Find the missing terms for the following arithmetic sequences. 7. 5, ____, _____, ____, 21 8. 148, _____, 128 __________________________________________________________________________________________________ 9. You decide to save money for college. Your grandmother gives you a brand new $100 bill. You decide to add $10 each month. At the end of the second month, you have $110. At the end of the third month, you have $120. How much will you have in one year? (at the end of the 12th month) ---------------------------------------------------------------------------------------------------------------------------------------------------------------10. What is the 13th term of the geometric sequence 11. What is the 10th term of the geometric where a1 128 and r 1 ? 2 that begins 28, 42, 63, … -------------------------------------------------------------------------------------------------------------------------------------------------------------Find the missing terms for the following geometric sequences. 12. -1.5, _____, ______, -187.5 13. 32, ____, 8