1) Find the 98th term of an arithmetic sequence whose first three terms are 2,6,10

Ans: 390

2)Write the 21st term in arithmetic sequence with a first term of 7, and a common difference of 5.

Ans: 107

3) Find the sum of the first term of the first six terms of the geometric sequence, 8,4,2. . .

Ans: 63/4

4) Insert two Geometric means between 4 and 256.

Ans: 16, 64

5) Find the eight term of a geometric sequence whose first three terms are 9,3, and 1.

Ans: 1/243

6)Find the sum of the first 30 terms of the arithmetic sequence 5,8,11. . .

Ans: 240

( I think I did number 6 wrong).