In which situation would you most likely use the tú form? con compañeros con figuras de autoridad con ancianos con profesores

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Turn this sentence into a negative sentence using double negation: hay alguien aquí. a. nadie aquí hay b. no hay nada aquí c. nadie hay aquí d. no hay nadie aquí

In the diagram, which must be true for point d to be anorthocenter? o be, cf, and ag are angle bisectors.be 1 ac, ag 1 bc, and cf 1 ab.be bisects ac, cf bisects ab, and ag bisects bc.be is a perpendicular bisector of ac, cf is aperpendicular bisector of ab, and ag is a perpendicularbisector of bc.