The question isn't complete and you might want to ask this in the math section.
But just to help you out, 3x means 3 times whatever "x" is.
C,D,&E just took the quiz.
C. Trade routes were opened and maintained
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Public schools in the United States were born of a dream of several individuals. The leader of the main movement was Horace Mann, who advocated that the state finance public education through taxes collected. Thus, the idea was to get the taxpayer (in this case, the taxpayer) to send his money to the government to direct him to spending on this type of school.
Answer: a) tax supported schools.
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Communal living would be a society where everyone lived in the same community and shared everything. So the answer is A.