Of course they are.
Yes
Yes, old Singapore currencies are still legal tender.
500 dollars. These bills were withdrawn in 69 but still in circulation and still legal tender.
The US has never stopped making $2 bills. They are made but are rarely seen in circulation. These bills are legal tender and can be spent.
The Australian Dollar is Legal Tender in Australia. The Bahamian Dollar is Legal Tender in the Bahamas. The Barbados Dollar is Legal Tender in Barbados. The Bermuda Dollar is Legal Tender in Bermuda. The Canadian Dollar is Legal Tender in Canada. The Fiji Dollar is Legal Tender in Fiji. The Hong Kong Dollar is Legal Tender in Hong Kong. The Jamaican Dollar is Legal Tender in Jamaica. The New Zealand Dollar is Legal Tender in New Zealand. The Singapore Dollar is Legal Tender in Singapore. The US Dollar is Legal Tender in the USA.
No, it is not allowed for any living president to be on US bills or coins. You may see some companies issue a "commemorative" coin to honor a current president, but such coins are for collectors and are not legal tender.
No, US $100 bills do not have an expiration date. They remain legal tender and can be used for transactions regardless of when they were issued.
1862 was the first year were the dollar bill was recognized as legal tender
Troops get paid. That money is legal tender. Yes their cars can get repo'd. Everyone has to pay their bills.
Yes, they are legal tender and still being printed, just not in nearly the same quantities as other bills.
All old U.S. currency is still legal tender at face value.
Yes penny's are legal tender.