ANSWERING EMAILS - Formal or Informal?

ARE THE FOLLOWING SENTENCES USED
IN FORMAL OR INFORMAL EMAILS?

Take care,

Write soon and tell us about your availability!

I would really like to have a better understanding of what a product manager does...

Do you think you could pass on any information about this subject?

Thanks for all your hard work on that report. Could you please get your version over to me by 8 a.m., so I don't miss my deadline?

Would you please let us know if this date is convenient for you ?

I need your documents by 4 p.m. today or I'll miss the deadline.

Please, send news.

Please, inform when you are arriving in São Paulo.

I am writing to inform our availabiltiy
for a meeting ...