A function Has a constant doubling time What type of function does this represent

What properties allow transformation to be used as a problem solving tool

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.

Sketch one cycle if the cosine function y=2cos2theta