Answer:
I do not know
Step-by-step explanation:
Answer: 
Step-by-step explanation:
We have given the numbers = 2,0,1,9
We can use addition and subtraction operation to the given numbers such that the answer will be equals to 6.
We can add 2 ,0 and 1 and then subtract from 9 , we will get 6.
So the required expression can be

hence, the required expression can be 
Answer:
the 2nd answer (II)
Step-by-step explanation:
1 and 2 are not rational if that's what your asking
Answer:
4/6 6/9 8/12 10/15
Step-by-step explanation: Split them into smaller fractions
3.14
This is typically what you would use but there are several other numbers after 3.14