Answer:
0.128
Step-by-step explanation:
Looking at the ratio of the numbers,
0 = 2
1 = 5
3 = 12.5
We can conclude that they are being multiplied by 2.5 every time.
2 x 2.5 = 5
5 x 2.5 = 12.5
This is the same for the negatives, only they are being divided.
2 ÷ 2.5 = 0.8
0.8 ÷ 2.5 = 0.32
0.32 ÷ 2.5 = 0.128
f(x) = 0.128