Can the supreme court strike down an unconstitutional law

In the united states, the government creates laws and regulations that business activities to prevent wrongdoing.

Which event is considered to be start of the "hellenistic era"? a) the founding of the roman empire b) the death of alexander the great c) the end of the peloponnesian wars d) the founding of the roman republic

What does it mean to say the united states has a federal system of government