find the next three terms of the given secquences.

1.) 3, 6, 9, 12, __, __, __

2.) 2,-3, -8, -13, __, __, __

3.) 1, 4, 16, 64, __, __, __

4.) 70, 58, 46, 34, __, __, __

5.) 2, 5, 7, 12, __, __, __

6.) 10, 100, 1000, __, __, __

7.) 2, 6, 18, 54, __, __, __

8.) 4.2, 5.3, 6.4, __, __, __

9.) -7, -9, -11, -13, __, __, __

10.) 4, 8, 16, 32, __, __, __

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