Find the nth term of the following sequences

Question 1:

4,16,36,64,100
4n2

Question 2:

2,8,18,32,50
2n2

Question 3:

-6,-3,2,9,18
n27

Question 4:

13,25,45,73,109
4n2+9

Question 5:

-1,3,13,29,51
3n25n+1

Question 6:

7,12,21,34,51
2n2n+6