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
Answer:
toward mainly west and south. across most of Central Asia. us. across the Himalayas into modern India.
Explanation:
3 4 5
I think unplugging DVD players