Hi there!
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I believe your answer is:
[tex](-8,-5)[/tex]
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Here’s why:
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[tex]\boxed{\text{Rule for a 90 degree Rotation Clockwise:}}\\\\(x,y)\rightarrow (y,-x)[/tex]
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[tex]\rightarrow (5,-8) \rightarrow \boxed{(-8, -5)}[/tex]
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Hope this helps you. I apologize if it’s incorrect.