The supreme court serves what important function in the us federal goverment

It has original jurisdiction over, and therefore the power to resolve, disputes between states.

Explanation:  It establishes legal precedents that are almost always followed by lower courts. Throughout the year, Supreme Court justices review cases that have been appealed to the Court. Essentially, it's role in ensuring that each branch of government, the President and Congress, recognizes the limits of its own power.

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 . : )