It depends on the kind of transformation.
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Dilation, rotation, reflection and translation
It means fully covered & completed.
The mean of a single number is the number itself. So the answer is 969.
It's a circle. The equation of a circle is x^2+y^2=r^2. So the equation you've given is a circle with a radius of 4 and, since there are no modifications to the x or y values, the center of the circle is located at (0,0).
In America it is math, in most European countries it is maths