Answer:
7.7- 3.51 goes to 8-4=4
3.5 -1.2 goes to 4-1 =3
22.78 - 14.12 goes to 23 - 14=9
16.208 - 3.652 goes to 16- 4= 12
it wants you to make a table of the inputs and out puts, and what is the pattern that is happening. like is it a constant increase/decrease and things like that. i'll help you on the table...
x | y
1 | 5
2 | 4
3 | 3
4 | 2
(i am not sure what that 40 is at the end, but You get the point)
now all you have to do is identify the sequence or pattern you see here