I believe the answer would be Bill Gates. An appositive is a noun that renames a noun right beside it. In this case, "Bill Gates" is renaming "One of the richest men in the world."
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Explanation: Paul-Edward is the son of a white farmer whose first name is Edward and a Black Native American mother. Paul's father had a white wife and had children with her, and refused to let Paul-Edward have his name Edward, as his mother wanted, because he hadn't allowed any of his white children to have his name, thus he was called Paul-Edward. Because he was multi-racial, Paul-Edward faced racism, ridicule, discrimination, and cruelty as he grew up.