Answer:
10.6,7.4,4.2,1,2.2,-5.4,8.6
Step-by-step explanation:
10.6,_,_,_,_,_,-8.6 ← 7th term
Find the common difference
Formula: an-ak/n-k
Given: an=-8.6, ak=10.6, n=7, k=1
> -8.6-10.6/7-1
> -19.2/6
> -3.2
↓↓↓
> 10.6+(-3.2)=7.4
> 7.4+(-3.2)=4.2
> 4.2+(-3.2)=1
> 1+(-3.2)=-2.2
> -2.2+(-3.2)=-5.4
> -5.4+(-3.2)=8.6
