HEL YOULL BE BRAINLIEST AN GET 50 POINTSS How are the daily exchange rates of national currencies determined?
A. They are established by the International Monetary Fund.
B. They fluctuate according to changes in the financial markets.
C. They are based on the amount of gold held by governments.
D. They are approved by World Trade Organization officials.

B.They fluctuate according to changes in the financial markets.

Explanation:

B

Explanation:

Currency prices can be determined in two main ways: a floating rate or a fixed rate. A floating rate is determined by the open market through supply and demand on global currency markets. ... 4 Therefore, most exchange rates are not set but are determined by on-going trading activity in the world's currency markets.

b) a state law could be declared illegal if it contradicted the constitution.

explanation:

the conflict of this case originated when james w. mcculloch, a cashier of the baltimore branch of the second bank of the united states that the congress had chartered in 1816, refused to pay a tax imposed by the maryland state.

in the case, the state of maryland appealed that the establishment of a second bank was unconstitutional since the constitution didn't say anything about granting that power to congress. however, the case determined that even if such right wasn't specifically stated in the constitution, it was part of the "implied powers" of the government enunciated in article i, section 8.

the case also eliminated maryland's legislation to impose taxes to a national bank, asserting that even though the states retained the power of taxation, the constitution's laws are supreme and can not be controlled by the states, therefore, if a state law contradicts the constitution, it should be declared illegal.

explanation: