What shap can you make with these

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.

Write a story that matches with the expression 42x-5 pls hurry

If 25% of y is 30, what is 60% of y?