Does it matter what interval you use when you find the rate of change of a proportional relationship

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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.

In the equation sqrt(n+5)-sqrt(11-10)=1. what is the value of n