Which event must happen for a case to be heard before the supreme court? five of the nine justices must agree to hear the case. three of the nine justices must agree to hear the case. six of the nine justices must agree to hear the case. four of the nine justices must agree to hear the case.

The correct answer is: Four of the nine justices must agree to hear the case.

For a case to be heard before the U.S Supreme Court, "Four of the nine justices must agree to hear the case," since only this can assure its relevance and importance. Article III, Section 1 of the Constitution established the Supreme Court of the United States with nine Justices on the Court. Before taking office, each Justice is appointed by the President and confirmed by the Senate. The Supreme Court has its own set of rules, and according to these rules, four of the nine Justices must vote to accept a case. 

In order for a case to be heard before the Supreme Court, "Four of the nine justices must agree to hear the case," since only this can assure its relevance and importance. 

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