Is the correct or this wrong, pleaee let me know if its wrong and explain

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.

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

Find a conversion factor between square centimeters and square meters. write it in three forms. square centimeters = 1 square meter