Question

Which sequence is geometric

A. 5 15 25 35 B. 5 10 20 40 C. 6 12 18 24 D. 7 14 21 28

Answer 1

its b

Explanation:

i took the test

Answer 2

If a, b, c, d is geometric sequence, then

`(b)/(a)=(c)/(b)=(d)/(c)=const.`

A. 5; 15; 25; 35

`(15)/(5)=3;\ (25)/(15)=(5)/(3)-NOT`

B. 5; 10; 20; 40

`(10)/(5)=2;\ (20)/(10)=2;\ (40)/(20)=2-YES`

C. 6; 12; 18; 24

`(12)/(6)=2;\ (18)/(12)=(3)/(2)-NOT`

D. 7; 14; 21; 28

`(14)/(7)=2;\ (21)/(14)=(3)/(2)-NOT`

Answer: The sequence B. 5; 10; 20; 40 is geometric.