Question

What is the common ratio of the following sequence?
7,-7,7, -7....

Answer 1

-1

Explanation:

`a_1=7\\a_2=-7\\a_3=7\\a_4=-7\\\vdots\\a_n=(-1)^(n+1)(7)\\\\\text{The common ratio is}\ r=-1`

`r=(a_(n+1))/(n)`

`(a_4)/(a_3)=(-7)/(7)=-1\\\\(a_3)/(a_2)=(7)/(-7)=-1\\\\(a_2)/(a_1)=(-7)/(7)=-1`

Answer 2

7,-7,7, -7

Explanation:

its a patten that is repeated with no change

i hope i have helped