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
<h2>Palmer Peninsula
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Antarctic Peninsula, also called Palmer Peninsula, Graham Land, or Tierra de O'Higgins, peninsula claimed by the United Kingdom, Chile, and Argentina. It forms an 800-mile (1,300-km) northward extension of Antarctica toward the southern tip of South America.
Answer:
The path of a total eclipse that is swept out by the umbra shadow of the moon on the earth. The umbra is the dark center portion of a shadow. The Moon's umbra causes total solar eclipses, and the Earth's umbra is involved in total and partial lunar eclipses.
I hope this helps