How do you say hellow how are in french?

"Hello, how are you?" in French can be said in a few different ways:

Formal:

* Bonjour, comment allez-vous ? (This is the most formal way to say it, used for someone you don't know well or are showing respect to.)

Informal:

* Salut, comment vas-tu ? (This is a more casual greeting, used for friends or people you know well.)

* Coucou, comment ça va ? (This is a very informal greeting, often used with close friends or family.)

You can also use these phrases:

* Bonjour, ça va ? (Hello, how are you? - slightly less formal than "comment allez-vous")

* Salut, ça va ? (Hi, how are you? - informal)

Important: The choice of greeting depends on the context and the person you are talking to. It's always a good idea to err on the side of formality, especially if you are unsure.