As the altitude increases, air becomes thinner, or less dense. An approximation of the density of air

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As the altitude increases, air becomes thinner, or less dense. An approximation of the density of air at an altitude of x meters above sea level is given by 


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The output is the density of air in kilograms per cubic meter. The domain of d is 0 ≤ x ≤ 10,000. 


(a) Denver is sometimes referred to as the mile-high city. Compare the density of air at sea level and in Denver.


(b) Determine the altitudes where the density is greater than 1 kilogram per cubic meter.

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