The answer to your question is 2.
It's $7.00 for it to be an average of $8.00 so B. *took the test*
<h3>
Answer: Choice C</h3>
Work Shown:

This matches with choice C. The imaginary 'i' term is not under the square root.
I am not really sure what your trying to explain. But i think the answer would be 120. If it is right and u want more explanation than i am happy to do so! :D