Answer:
6
Step-by-step explanation:

Since it's 5.56, you'll want to round UP because 5 is in the tenths and is closer to 6
<h2>
Answer</h2>
The answer to this question is 0.9
<h2>
Explanation</h2>
We know that
sequre of 9 is equal to 81 as 
Then sequre of 0.9 will be

So,
b = 
b = 
Exponent and square root cancel out each other
So, the answer is 0.9.