Answer:
The simplified expression for the given expression will be:
c. 
Step-by-step explanation:
Given expression:

To simplify the expression.
Solution:
In order to simplify the expression, we will first remove the parenthesis by reversing the signs of the terms inside the parenthesis which lies after a negative sign out side the parenthesis.
<em>This is because negative multiplies to a negative to give a positive and negative multiplies to a positive to give a negative.</em>
So, we have:
⇒ 
Combining like terms
⇒ 
<em>The like terms can be evaluated as</em>


Thus, the simplified expression will be:
⇒ 
Answer:
4.5
Step-by-step explanation:
I just use a calculator for this.
2 sqrt 5 = 4.4721
If we round off to the nearest tenth, it would be 4.5.
The answer to your question is 22.
10/40 * 100= 25%
25% is the answer.