Sequences

Identify arithmetic sequences

A sequence is given: 7, 5, 3, 1, -1,...   1)    Is this sequence arithmetic or geometric? Explain 2)    Write a recursive rule and an explicit rule for each of the following sequences.  
For each rule, generate the first 5 terms of the sequence that is defined. In each case, n is an integer and n ≥ 2. a.       f(1) = 4    f(n) = 5 + f(n – 1)  b.       f(1) = –3   f(n) = –2 × f(n –