Question

Which statements about geometric sequences are correct? Check all that apply. In a geometric sequence, the ratio between each of the consecutive terms is the same, or constant.
Multiply the common ratio by the last term to extend a geometric sequence.
The sequence 2, 8, 32, 128, . . . is geometric.
The sequence 5, 10, 15, 20, . . . is geometric.
The sequence 3, 18, 108, 648, . . . is geometric.

Answer 1

Answer: the 1st & 3rd sequence is correct

Step-by-step explanation:

R=a2/a1

8/2=4

2*4=8

8*4=32

32*4=128

Same for the other sequence

10/5=2

5*2=10

10*2=20 therefore this is not a geometric

Last is 18/3=6

3*6=18

18*6=108

108*6= 648