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### Question 9

Find the nth term formulae of the following sequences:

(a) | \( 1, 4, 9, 16, 25, 36\) | (b) | \( 4, 7, 12, 19, 28, 29\) | (c) | \( 2, 8, 18, 32, 50, 72\) |

(d) | \( -1, 2, 7, 14, 23, 34\) | (e) | \( 3, 12, 27, 48, 75, 108\) | (f) | \( 5, 11, 21, 35, 53, 75\) |

(g) | \( 6, 20, 42, 72, 110, 156\) | (h) | \( 3, 3, 7, 15, 27, 43\) | (i) | \( 5, 16, 29, 44, 61, 80\) |

(j) | \( 6, 25, 54, 93, 142, 201\) | (k) | \( 2, 12, 30, 56, 90, 132 \) | (l) | \( 23, 46, 81, 128, 187, 258\) |