The number of commercial airline boardings on domestic flightsincreased steadily during the 1990s as shown in the table below.Let? f(t) be the number of commercial airline boardings on domesticflights? (in millions) for the year that is t years since 1990.
Numbers of Commercial Airline Boardings on Domestic Flights
f f(x)
Year Number of Boardings? (millions)
1991 452
1995 547
1997 599
1999 635
2000 666
Find an equation of f.
