If a letter is brief, be sure to explain why.

True

False

Be sure to explain why what?

I don't understand what you're supposed to state true or false about.

is it true ( or false) that it is polite to explain why your letter is brief (if it is brief.)

It's polite, but probably unnecessary.

ty. :)

YW!!

true

the correct answer is false

Typing an informal letter is acceptable, but a typed letter is considered more formal than a handwritten one.

True
False

What is the principle behind all social notes?

wanting to be given more, or to be invited back again
sincere appreciation for the kindness

false