Please help with number 3 :)

n^2 + 3

n^2 - 2

3n^2.

Step-by-step explanation:

(a)

n      =      1  2  3   4    5

terms =   4  7  12  19  28

n^2 =        1  4    9  16  25

Subtract:  3  3    3   3    3

So the nth term is  n^2 + 3

(b)

n =               1    2   3   4   5

terms =      -1   2   7  14  23

n^2 =            1    4   9 16   25

n^2 - term =  2  2   2  2    2

So it is n^2 - 2

(c)

n =                 1    2   3   4   5

terms           3  12 27 48 75

n^2 =             1    4   9 16   25

each term = 3 * n^2

5x+10 is the correct one

hope this