yes
U S dollars
Yes, definitely
Some retailers accept US dollars though not all.
Jean-Louis Wolzfeld is the Ambassador to the US for Luxembourg.
Some small businesses accept dollars, but it is better to convert your dollars to Hungarian Forints (in an airport, train station, or bank, for instance).
No, dollars are not an accepted payment currency. Some tourist companies might accept US dollars as providing you with an additional service. Banks, Exchange offices and ATM's are widely spread, so there is no urgency to accept dollars. Nowadays, everybody with bank cards or credit cards can easily draw AED, Arab Emirates Dirhams from ATM's.
999999 chombowons. this is about 5 u.s dollars or 1232123216457 Nz dollars
Yes, most places will accept them and give you change in Vietnamese Dong
Perhaps right around the Canada/US border but otherwise probably not. US stores generally do not accept any foreign currencies.
Literal answer - very little, because virtually no businesses accept payment in US dollars. But you could take it to a bank, and you would get about £65.
A person can pay rent in US dollars in Canada in certain places. In Canada, places like Toronto and Vancouver accept American currency as payment for things such as rent.