<u>ANSWER</u>

<u>EXPLANATION</u>
Given 
and

We want to find

This means we substitute the function
in to another function
and evaluate.
This implies that;

We expand the parenthesis to obtain;

We simplify further to obtain;

Hence the correct answer is A
What is the question that you are asking? Do you need to write an equation?
Answer:
$6898.50
Step-by-step explanation:
Cost price of one book = $10.95
Question says 630 friends bought her books.
And asks for total sales she made.
So we multiply cost of one book with the number of customers , it will give us the total sales.
So
Total sales = $10.95 * 630 = $6898.50
Total sales = $6898.50
Answer(C)
√(9x^2)= 3x
√(18y^2)=3y/√2= 3y/√2 X √2/√2
=3√2y/2