How do you say "why" in french.

Tous les départements français sont numérotés et apparaissent sur la plaque d’immatriculation et dans le code postal. quel est ce numéro pour la martinique?

Ineed in french. could someone check over a question in french? i am writing 'i am drinking water.' in french, can you check if it is correct? my french text: je suis le fait de boire l'eau

Sally was visiting france and on a tour with one of her friends that live in paris. her friend, chloe bumped in the someone she must have known and they started talking. sally wanted to ask them is they were friends and how they meet but she forget how to say it it french. how do you say, hi my name is sally, are you friends with chloe in french