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Question

The number of domestic car sales from 1981-1999 in millions is modeled by the expression y=-0.01n^2 + 0.11n + 6.51 where n is the number of years since 1981. The number of import car sales from 1981-1999 in millions is modeled by the expression y = 0.02n + 2.57. Find an expression that models the total number of car sales n years since 1981.

Answer 1

The total number of cars sales is the sum of the number of domestic and import cars. A model which represents the total number of car sales is the sum of both models in the question.