The requirement for supreme court decisions issued by the justices is that? a. all nine justices must agree on a case to be decided b. three-fourths of the justices must agree on a case to be decided c. a simple majority is all that is needed to decide a case

The correct option is C.
For a supreme court to hear an appeal case, four of the nine judges must vote to accept the case. For a supreme court decision by the judges to be considered valid, a majority of justices must agree to all the contents of the court's opinion before it is publicly delivered. Justices do this by signing the opinion.

The changes to agriculture in the united states since 1900 is that increased mechanization has increased food production, thereby increasing the need for labor. there has been an increased need for higher speeds of food production due the fact that the population in the united states continues to rise.