Formal Vs. Informal with Technology

You're asking your friend about the field trip tomorrow. What kind of situation is this? Formal or informal? Why? Complete sentence

You need to communicate with the high school counselor to ask for registration information. What kind of situation is this? Formal or informal? Why? Complete sentence

You need to ask one of your parent's friends if they can give you a ride to school. What kind of situation is this? Formal or informal? Why? Complete sentence

You need to communicate with a classmate that you don't know that well regarding a group project that is due next week to check on their part of the project. What kind of situation is this? Formal or informal? Why? Complete sentence