College Algebra & Trigonometry, 2018a

6.2. ARITHMETIC AND GEOMETRIC SEQUENCES 295
Exercises 6.2
Determine whether each sequence is arithmetic, geometric or neither.
If it is arithmetic, determine the constant difference.
If it is geometric determine the constant ratio.
1) {18, 22, 26, 30, 34, ...} 2) {9, 19, 199, 1999, ...}
3) {8, 12, 18, 27, ...} 4) {15, 7, −1, −9, −17, ...}
5)
{ 1
2 , 2 3 , 3 4 , 4 5 , 5 6 , ... }
6) {100, −50, 25, −12.5, ...}
7) {−8, 12, 32, 52, ...} 8) {1, 4, 9, 16, 25, ...}
9) {11, 101, 1001, 10001, ...} 10) {12, 15, 18, 21, 24, ...}
11) {80, 20, 5, 1.25, ...} 12) {5, 15, 45, 135, 405, ...}
13) {1, 3, 6, 10, 15, ...} 14) {2, 4, 6, 8, 10, ...}
15) {−1, −2, −4, −8, −16, ...} 16) {1, 1, 2, 3, 5, 8, 13, 21, ...}