Find the 66th term: 12, 11.2, 10.4, 9.6

Question

a) -28

b) -32

c) -36

d) -40

Answer 1

Georgia,

You need to look at the sequence to see if you recognize any pattern, like a common difference for an arithmetic sequence or a common ratio for a geometric sequence. Once you identify the type of sequence, just apply the appropriate formula for the nth term:

a_n = a₁ + (n-1)*d for an arithmetic sequence

a_n = a₁*r^(n-1) for a geometric sequence