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In 2002 the cost of a textbook was $120.00 and in 2013 it was $212.00. a. Assuming the cost of the textbook increases linearly as a function of time, give the function of the cost of the textbook since 2002. b. Give the interpretation of the slope of the function in part (a). c. A book is considered to be unaffordable when its price is more than $300.00. If the increase in price follows this linear trend, when will the book be unaffordable?