Why would the development of a number system be important in a civilization that depended on trade

What directive in source a might have been at the root of the action described in source b?

Why is the federal reserve managed under the oversight of the federal government? the fed is responsible for printing and coining money.the fed is responsible for collecting income taxes.the fed is responsible for the government’s money.the fed is responsible for paying off government debt.(the first option isn't correct i tried that one)edit: the answer is the fed is responsible for the government’s money.

In what ways was england's absolute monarchy similar to and different from constitutional monarchy?