What is r2 in the regression of problem 10€“16?

In problem An article in Worth discusses the immense success of one of the world€™s most prestigious cars, the Aston Martin Vanquish. This car is expected to keep its value as it ages. Although this model is new, the article reports resale values of earlier Aston Martin models over various decades.

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Decade: Present value of Aston Martin model (average $180,000 $40,000 $60,000 $160,000 $200,000 1960s 1970s 1980s 1990s 2000s