From 1980 to 1991, the total fuel consumption T (in billions of gallons) by cars in the United States and the average fuel consumption A (in gallons per car) can be modeled by T = - 0.026x 3 + 0.47x 2 - 2.2x + 72 and A= - 8.4x + 580 where x is the number of years since 1980. Find a function for the number of cars from 1980 to 1991. About how many cars were there in 1990?
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-3/5+ 6^ 0.34+ 27-73.248
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