#1: 

Hello!
How are you?


Today I learned these phrases both in English and Spanish! 
In Spanish you say:

Hola!

Como estas?

Now in casual Japanese.

やぁ!
元気?

You can use them between friends.
There are many ways to answer them.
Example:


やぁ、元気?

うん、元気。
Muchas gracias!