Determine whether each sequence is geometric. If so, find a common ratio.

Question

1.) 3, 9, 27, 81

2.) 4, 8, 12, 16

3.) 4, -8, 16, -32

4.) 100, 30, 9, 2.7

5.) -5, 0, 5, 10

6.) 1, 4, 9, 16

Answer 1

1) 3

2) not geometric. arithmetic with common difference = 4

3) -2

4) 3 1/3

5) not geometric, arithmetic with common difference = 5

6) not geometric. AN= N^2 each term is the square of N when N means the nth term