Question

Which best describes the relationship between the successive terms in the sequence shown?

9, –1, –11, –21, …

aThe common difference is –10.
bThe common difference is 10.
cThe common ratio is –9.
dThe common ratio is 9.

Answer 1

I took the test and got it right. It is A. Good luck!

Answer 2

the common difference is -10....that just means u have to add -10 to each number to find the next number

9 - 10 = -1
-1 - 10 = - 11
-11 - 10 = -21
etc...

** basically, common difference means u add and common ratio means u multiply