Answer: 1st,2nd, and 4th one are correct.
Step-by-step explanation:
Don’t know the answer nor the explanation ! Same situation as of yours !
Yh I think the missing number will be 6 because they are equivalent to 1:2
We are given 85
Firstly, we will find all possible factors of 85
we can write it as

so, exponential form is
................Answer
Check the attached file for the solution.