He positive integers general term of a sequence 2. an ordering of quantities separated by commas series 3. the sum of the terms of an associated sequence arithmetic series 4. one of the individual quantities of a sequence alternating sequence 5. a formula that yields the value of a term when that term is substituted in it term of a sequence 6. a series that has a common difference between terms natural numbers 7. a series that has a common ratio between terms sequence 8. a sequence in which each successive terms changes sign geometric series