When a case is appealed to the U. S. Supreme Court, the court can do which of the following?

Appeals are decided by panels of three judges. The court of appeals does not receive additional evidence or hear witnesses; rather the judges make their decision based on the written record of the case in the trial court, the briefs submitted by the parties, and possibly oral argument.

Explanation:

checks and balances are needed to keep the government running smoothly, they allow the three branches of government to overrule one another so that one branch of government does not become too powerful.