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(Modeling) Number of Airport, in the U.S. The number of airports in the United States during the period 1970–1997 can be approximated by the equation
y = −6.77x2 + 445.34x + 11,279.82,
where x = 0 corresponds to 1970, x = 1 to 1971, and so on. According to this model, how many airports were there in 1980?
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