Chapter 8 covers arithmetic and geometric sequences along with sums of sequences called series.
Pertinent Formulas; 
1) Nth term of an arithmetic sequence; An=A1+(n-1)d 
2) Nth term of a geometric sequence; An=A1(r)^(n-1)
3) Sum of an Arithmetic sequence (Arithmetic Series); n/2(A1 + An)
Section Level of Difficulty; 4
Number of Questions; 13