The monetary base is equal to
a. all currency in circulation plus reserves held by banks.
b. all currency in circulation plus checkable deposits in financial institutions.
c. all currency in circulation plus all deposits in financial institutions.
d. checkable deposits in depository institutions plus reserves held by banks.

The correct answer is option A.

Explanation:

The monetary base can be defined as the amount of money that is in circulation in the hands of the public or held as reserves by banks.  

The monetary base in an economy is equal to all currency in circulation plus reserves held by banks.  

In other words, it includes highly liquid funds such as coins, notes, and bank deposits.  

The money supply is a broader concept than the monetary base and includes the monetary base and other assets as well.

x=3

step-by-step explanation:

this is really simple i saw that there was only one term (5x) and thought if that was 15 what would i have to multiply everything else to get it there? well if 5x became 15 then x would have to be 3 so plug the 3 in the x for the other equations and you get 15 for the other ones. so there you go. : )

it should be