Yes you do if you don't it will come back to you.
3 Just one stamp will do it for a normal letter.
The reason you need a stamp to mail a letter is because the stamp is the proof that you paid for your letter to be delivered. Instead of paying the mailman directly, and waiting for him to come to your house so you can pay the mailman to deliver your mail, the stamp proves that you paid for the delivery of the mail.
an address, a postage stamp and a letter to stick it to.
1
One ounce letter, one stamp.
no you do not need a stamp
You still only need a 42 cent stamp as long as the letter is under half an ounce.
If you are sending a normal-sized letter, you would need $0.49 total of stamps to mail it from Indiana to California. You could use a Forever stamp or a combination of other stamps that equals $0.49.
It depends on the weight and size and if you're sending it from within the US or from outside. If you can't figure it out on your own, go to your local post office and they'll calculate it for you, but for an ordinary letter-size letter weighing less than an ounce, you just need one first-class mail stamp.
yes, you pretty much ALWAYS need a stamp to send a letter in the mail. :)
One stamp if it's a normal letter. If its heavy, or is excessively large it'll require more stamps.
no
Yes. Every letter mailed in the US needs a stamp.
Yes, you do need a stamp wherever you post anything.
Just go visit him at the mall.
3 Just one stamp will do it for a normal letter.
The stamp has to be accepted where you mail the letter. If you are mailing in Canada, you need a Canadian stamp. If you are in the US mailing to Canada, you can use a US stamp.