Which of the following terms refer to the area of law that defines the relationship between the federal government and state governments?

Federalism.

You did not provide the "following terms", but federalism refers to the relationship between federal & state governments.

anticipatory breach of contract

as the name suggests, an anticipatory breach is a breach of contract before the time of performance. so, if a promisor denies to perform his promise and signifies his unwillingness before the time for performance, then it is an anticipatory breach of contract.

and

actual breach of contract

while an anticipatory breach is before the time of performance, an actual breach of contract is on the scheduled time of performance of the contract. an actual breach of contract can be committed either.

hope this . : )

is it i don't know all i hear is cluck cluck?