Squared, multiplied by itself
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that they are the same size
You will need to explain the question in more detail. What do you mean by finding the mean of a number? The mean of a number is just that number. Did you intend the mean of a set of numbers? And if so, how many?
It has only two factors.
A superscript 2 above any number means that number is multiplied by itself. This is called a squared number. If this is over a fraction, then it could either apply to just the numerator or the entire fraction depending on whether or not there are brackets.
There are two 7s in the number. Which one do you mean by the 7?