Work out the next term of this quadratic sequence

6 9 15 24

36

Step-by-step explanation:

6 9 15 24 ...

The sequence goes like this:

+3, + 6, + 9, + 12, + 15 (Adding 3 each time)

For example:

6 + 3 = 9 (First + 3)

9 + 6 = 15 (Then + 6)

15 + 9 = 24 (Then + 9)

24 + 12 = 36