Forms of money in the united states consist of paper money, coins, and bartering minting checking account balances

Checking account balance is the correct answer.

Step-by-step explanation:

Forms of money in the United States consist of paper money, coins, and Checking account balances.

( A checking account is a bank account that allows you easy access to your money via debit cards, writing checks, and withdrawals.

Checking accounts are also called demand accounts or transactional accounts.

It differs from other bank accounts in the way that it often allows for numerous withdrawals and unlimited deposits )

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value