The amount of carbon dioxide (in pounds per 15,000 cubic miles) released by a typical SUV depends on its fuel efficiency according to the formula W=32 x{2}-2,080 x+44,000 (12 leq x leq 33) where x is the fuel efficiency of an SUV in miles per gallon. According to the model, what is the fuel efficiency of the SUV with the least carbon dioxide pollution? Comment on the reliability of the model for fuel efficiencies that exceed your answer.
a) Fuel efficiency of the SUV with the least CO2 pollution is 32 mpg. The model is reliable for fuel efficiencies below 32 mpg.
b) Fuel efficiency of the SUV with the least CO2 pollution is 25 mpg. The model is reliable for fuel efficiencies below 25 mpg.
c) Fuel efficiency of the SUV with the least CO2 pollution is 12 mpg. The model is reliable for all fuel efficiencies within the given range.
d) Fuel efficiency of the SUV with the least CO2 pollution is 33 mpg. The model is reliable for fuel efficiencies below 33 mpg.