29. Table 2.7 shows the area, A, covered by Arctic sea ice in millions of square kilometers between 2017 and 2020.12 Let A = f(t) for t in years since 2000. (a) Does f'(1) appear to be positive or negative? Inter- pret in terms of Arctic sea ice. (b) What is ƒ(17)? Estimate f'(17). Give units. (c) What is f(20)? Estimate f'(20). Give units. Table 2.7 Year Sea Ice (mn km²) 2017 2018 2019 2020 4.82 4.79 4.36 3.92

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