Type the correct answer in each box. use numerals instead of words. if necessary, use / for the fraction bar(s).
(3a3 − 5b3) +{ }a3 +{ } b3 = (a3 + b3).

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.