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If the regression line comparing the age of a used car to its price has the equation c = -3000a + 36000, what is the

If the regression line comparing the age of a used car to its price has the equation c = -3000a + 36000, what is the expected cost of an 8-year-old car?

a $0

b $6,000

c $9,000

d $12,000

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