Arithmetic sequences: recursion, nth-term rules and linear growth and decay

What this note covers

1. Sequences, terms and recursion
2. The arithmetic sequence and its recurrence relation
3. Deducing the rule for the nth term
4. Tabular and graphical form: why arithmetic means linear
5. Modelling linear growth and decay in practical situations
6. Working backwards: finding a, d or n
7. Keeping the indexing straight
8. How this is examined in the WACE paper

8 sections · 12 key terms & formulas · 6 common mistakes