Answer:
b and c
Step-by-step explanation:
a) -9, 3, -1, 1/3, -1/9, . . . . .
-9 * (-1/3) = 3
3 * (-1/3) = -1
Here the common ratio is -1/3
b) -1/2, -1/6, -1/18, -1/54, -1/162, . . . .
-1/2 * 1/3 = -1/6
-1/6 * 1/3 = -1/18
It has common ratio of 1/3 //Answer
c) 900, 300, 100, 100/3, 100/9, . . . .
900 * 1/3 = 300
300 * 1/3 = 100
Common ratio of 1/3 //Answer
d) 100, 300, 900, 2700, 1800, . . . . .
100 * 3 = 300
300 * 3 = 900
Common ratio of 3
//Hope it helps
