Find the nth term of the following sequences

Question 1:

3,12,27,48,75
3n2

Question 2:

1,4,9,16,25
n2

Question 3:

10,13,18,25,34
n2+9

Question 4:

-1,11,31,59,95
4n2−5

Question 5:

-7,4,23,50,85
4n2−n−10

Question 6:

5,12,27,50,81
4n2−5n+6