How can you tell if a quotient is less than 1?

What is the equation of the graph below? y=sec(x)-4

Name the most appropriate metric unit for each measurement

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.