What is the complete patter?
0.02 0.2 20

Step-by-step explanation:

Since we have given that

There is a pattern :

In First term,  2 is divided by 100 i.e. 0.02

In Second term, 2 is divided by 10 i.e. 0.2

In Third term, 2 is multiplied by 1 i.e. 2

In Fourth term, 2 is multiplied by 10 i.e. 20

In Fifth term, 2 is multiplied by 100 i.e. 200

In Sixth term, 2 is multiplied by 1000 i.e. 2000

So,

Sequence becomes

a is 8.b is 10.c is 10.5. d is -.5

step-by-step explanation:

just minus the smallest number from the biggest.