You mean how many? One 98 cent stamp.
depends on how heavy it is
500 if your in America/Canada
what the price to mail letter to
how many forever stamps = .94
5
No, the postman will ignore it. Go get stamps.
typicaly 2 stamps
maybe 2 0r 3 stamps
Stamps show that you have paid the money to have the letter delivered.
No, you must use US postage stamps.
depends how heavy the letter is
Yes.