The atmospheric CO₂ level A(t) at Mauna Loa, Hawaii, at time t (in parts per million by volume) is recorded by the Scripps Institution of Oceanography. Reading across, the annual values for the 4-year intervals are

(a) Estimate A'(t) in 1962, 1970, 1978, 1986, 1994, 2002, and 2010.
(b) In which of the years from (a) did the approximation to A'(t) take on its largest and smallest values?
(c) In which of these years does the approximation suggest that the CO₂ level was the most constant?

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1960 1964 1968 316.91 319.20 323.05 1988 351.48 356.37 1992 1996 1980 1984 344.42 1972 1976 327.45 332.15 338.69 2000 2004 2008 362.64 369.48 377.38 385.34 2012 393.87