Solve the proportion.
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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.

Can someone me out here and the tell me the greatest common factor

What is the effect on the graph of the function f(x)=x when f(x) is replaced with -f(x)+4