The Supreme Court created a rule in : Students' right to free speech can be curtailed only if it "materially and substantially interferes with the requirements of appropriate discipline in the operation of the school."

Tinker

Explanation:

Tinker is an attempt to improve already existing rule through modifications or restrictions or introduction of a guiding clause.

The supreme court rule rule has a guiding clause (tinker) to curtail student's right to free speech in order not to give room for actions that could interfere with the requirements of the school

answer; i believe that the correct answer is rapid and subsequently slow down;

the historians cited in the article all agree with one another about the cause of the civil war. despite coming from different backgrounds and cultures, the historians agree that slavery was the root cause of the civil war. the fact that all these historiansgenerally agree with one another makes their shared viewpoints more reliable and valid, especially because the historians have different backgrounds and all work for the well-respected institutions of howard university, clemson university, and the university of colorado.