Anybody know? Need help

Answer this question! 30 points and brainliest! only if you know the answer.

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.

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?