#6 Help ​

6....Definitely not.....the difference  between  the terms is not an additive/subtractive  constant

7.   

 20  16  12 

The nth term is given by

20  - 4 (n - 1)

So....the 12th  term is

20 - 4(12 - 1)  =

20 - 4(11)  =

20 - 44  =

-24