What is the decay factor that corresponds to a 99% decrease?

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.

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

Which shows one way to determine the factors of 4x3 + x2 – 8x – 2 by grouping?