Question

What is the nth term of 4,7,12,19,28

Answer 1

7-4=3
12-7=5
19-12=7
28-19=9
The sequence starts from 3 and you keep adding 2...
Hope this helps

Answer 2

n-squared plus 3 would be the answer.

Examples:
1-squared plus 3 is equal to four.
2-squared plus 3 is equal to seven.
3-squared plus 3 is equal to twelve.
4-squared plus 3 is equal to nineteen.
And so on..