During a 7-year period, the amounts (in millions of dollars) spent each year on buying new vehicles N and used vehicles U by United States residents are modeled by the equations



where t=1 represents the first year in the 7-year period.      

Write a polynomial that represents the total amount spent each year on buying new and used vehicles in the 7-year period.
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1 Answer

The total amount spent is N+U:


-0.028t^3-0.32t^2+1.6t+59. This is the polynomial.
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