f.1數學問題.超急 請數學高手入

1. observe the patterns of the following sequences,then write down the 5th term and the 6th them of each sequence.
(a)2,7,12,17...
(b)4,12,36,108

2.observe the pattern of each of the following sequences,write down the next three terms of the sequence and determine what kind of sequence it is.
(a)2,4,6,8
(b)5,3,1,-1
(c)1,2,4,8
(d)384,198,96,48

3. it is known that the 9th term and the 10th term of the fibonacci sequence are 34 and 55 respectively,find the 8th term and the 11th term of the sequence.

thx!!