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The image of a sphere shape is a circle, no matter what direction you look at it from.
Negative and Positive it depends on how you look at it. But mostly negative.
Basically your image becomes magnified. I'm not sure about this, but I think the image produced is a "virtual image"
You put the negative to the side, before the fraction, or you put the negative in the numerator, so it's a negative fraction. It can look like this: -1/2 or the negative can be on the side of the fraction
7-(-13) also equals: 7+13. Because, if you look at it, you can see that -(- can look like a positive. This is because taking negative from a negative can be considered adding! Isn't this unique?