I've got a couple questions I could use some help on 50 point reward

1. Find the 9th term of this sequence.

27, 9, 3, 1, ...

A.) -1/3
B.) 1/243
C.) 0
D.) -1/234

2. Find the first five terms of the sequence given the following recursive formula: a_1 = 8 and a_n = 10 - 3a_n-1, for n is greater than or equal to 2

3. What is the 9th term in the geometric sequence in which a_3 is 36 and a_6 is 972?

4. Find the next two terms of the following sequence: -21, -9, 11, 39, ...

5.
Use the explicit formula, a_n = (-1)^n(13n-6) , to find the first five terms of the sequence.