1. Work out the 11th term of the sequence 6, 9, 14, 21, 30, ...
2. Work out the 15th term of the sequence −3, 0, 5, 12, 21, ...
3. Work out the 17th term of the sequence −5, 1, 11, 25, 43, ...
4. Work out the 9th term of the sequence 14, 20, 30, 44, 62, ...
5. Work out the 20th term of the sequence 10, 19, 34, 55, 82, ...
6. Work out the 19th term of the sequence −9, 0, 15, 36, 63, ...
7. Work out the 21st term of the sequence 14, 23, 38, 59, 86, ...
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