By rename do you mean turn into an improper fraction?
if so, it is because without turning it into an improper fraction, you cannot subtract 3/4 from 1/4 because you would get a negative answer and that would be incorrect
A.advances in shipbuilding
Answer:
What the governments of the Zhou dynasty in China and European kingdoms during the Middle Ages had in common was that "they were absolute monarchies.
Explanation:
hope that helps :)