Answer:
Step-by-step explanation:
The eights term is 12 ..... nine more terms added to this becomes 15
so the common difference, d = 3/9 = 1/3 ....each term has 1/3 added to it to find the next term . Then a1 = 12 - 7/3 = 9 2/3
the equation is then
an = 9 2/3 + (1/3) (n-1) WHICH CAN BE WRITTEN
9 1/3 - 1/3 n
