It depends on the point of origin, the weight, the class of the mail, the form of transport used.
If unsure, and not able to go to a post office to weigh your letter, I would go with five regular stamps to make sure. I have done this with letters to Greece and they always got there fine.
If you have a military address, one stamp should be fine if your letter is up to 3 pages. More per ounce after that. Otherwise, check out the related link to calculate the amount.
Should just be one, if you're using the current postage stamps with the correct postage rate on them.
typicaly 2 stamps
75 cents.
only one
One. From USPS web site: "Forever Stamps can be used to mail a one-ounce letter regardless of when the stamps are purchased or used and no matter how prices may change in the future.
It depends on the size and weight, but if it's a regular letter, a 44-cent stamp will suffice.
what the price to mail letter to
how many forever stamps = .94
5
No, the postman will ignore it. Go get stamps.
Stamps show that you have paid the money to have the letter delivered.
maybe 2 0r 3 stamps
No, you must use US postage stamps.