What is the answer to these? I don’t know if I’m doing it right or not. Is it perpendicular? Yes or no please explain

Step-by-step explanation:
5. Not enough information. We know that the line C is on bisects AB, but we don't know that it's perpendicular.
6. Not enough information. We don't know if the line C is on bisects AB or if it's perpendicular.
7. Yes. The line C is on bisects AB and is also perpendicular.