What is the slope of the line graphed above ?

Evaluate the following expression 1/3^2

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.

8000 + 8800 + 8000 + 8 million + 80 trillion + another a katrillion equals