If an is a5
and
an-1 is a4
then using your recursive formula for an arithmetic sequence
an=an-1 +d
then
a5=a4+d
now, a4 =6 and common difference "d" is d=-11
hence
a5=6 -11
6-11= -5
any questions?
C.,E
skjsjsnakakajJjjJjejekm
adding 320,294,265 and 301=1180
4 divided by 1180=answer 295
The fourth one down is the correct answer trust me
Keep the bases of 6 and add exponents: 
Keep the bases of 11 and add exponents: 
So its C.
hope that helps :)