Answer:
The descending order is 9, 4, 4/5, 2/4, 0.09
Step-by-step explanation:
Consider the provided numbers.
First convert all the numbers into decimal form as shown:
, 0.09, 4, 9, 
Now we need to arrange them in descending order.
The greatest number among them is 9.
After that the 2nd greatest number is 4 then 0.8, 0.5 and the smallest number is 0.09
Thus, the descending order is 9, 4, 4/5, 2/4, 0.09