Why is statement I incorrect?

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Hello, can you please explain why statement I is incorrect?
And can x and y be possibly negative numbers?
Thanks in advance
 

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Hello, can you please explain why statement I is incorrect?
And can x and y be possibly negative numbers?
Thanks in advance
Why do you say I is incorrect? Did you pick only I? Maybe it's considered incorrect because I is not the only true statement.
x and y can be negative.
 
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