Answer:
2
Step-by-step explanation:
The answer is 2 because 22-20 is 2
The equation is not linear
So lets take apart the question step by step:
22-20/ 2008-2007= 2/1= 2
21-22/2009-2008= -1/1= -1
14-21/2010-2009= -7/1= -7
19-14/2011-2010= 5/1= 5
