Answer:
Question A)

Question B)

Question C)

Step-by-step explanation:
A)
We are given:

We can rewrite the expression:

The square root and square will cancel each other out. Thus:

B)
We are given:

Rewrite:

Note that the square root of 9 is simply 3. We can also factor the second part:

Rewriting:

Simplify:

C)
We are given:

Rewrite. Note that 50 = 25(2):

Simplify. We can rewrite the factor as:

The square and square root will cancel out. Thus:

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Answer:
12.10 out of 58.60 is 20.648464163822524 or 21%
Step-by-step explanation:
work out the difference (increase) between the two numbers you are comparing
Increase = New Number - Original Number
Divide the increase by the original number and then multiply the answer by 100
% increase = Increase ÷ Original Number × 100.