The correct answer (sample response) is:
The image seems to be behind the mirror, but nothing is really there.
Include the following in your response:
The image appears to be behind the mirror.
If someone looks behind the mirror, there is no image there.

Answer:
4.54
Explanation:
X+10X=50
11X=50
X=4.54#
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The answer is to remove 4 electrons.
Here is a helpful video https://www.khanacademy.org/_render