Help me with this question

Which is the completely factored from of xy^3-x^3y

In the 30-60-90 triangle below side s has a length of and side r has a length

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.