Find the first five terms of these recursively-defined sequences: 9. a1 = 2, an = 2an-1 - 5 10. a1 = 3, an = an-1 + 3 11. a1 = 2, a2 = 4, an = an-1 + an-2 Find a recursive formula for each of the following. 12. 5, 7, 9, 11, ... 13. 4, 12, 36, ... 14. 2, 1, 3, 4, 7, 11