Question

Is the sequence arithmetic? If so, identify the common difference.

14, 21, 42, 77, ...

yes; 7
yes; –7
yes; 14
no

6.What is the 12th term of the sequence 10, 6, 2, …?

–16
–24
–34
–38

Answer 1

first one D.

Answer 2

second C

Answer 3

Am I right?

Answer 4

Yes, both correct. First one doesn't have a common difference. Second one looks like\[a_n = 14-4n, \implies a_{12}=14-4(12) = -34\]