OG详解-OG2 数学2 Q9

Choice A is correct. It’s given that the function  g  models the number of gallons that remain from a full gas tank in a car after driving  m  miles. In the given function g(m)=-0.05m +12.1, the coefficient of m  is -0.05. This means that for every increase in the value of m by 1, the value of g(m) decreases by  0.05 . It follows that for each mile driven, there is a decrease of  0.05  gallons of gasoline.  Therefore, 0.05  gallons of gasoline are used to drive each mile.
Choice B is incorrect and represents the number of gallons of gasoline in a full gas tank. Choice C is incorrect and may result from conceptual errors. Choice D is incorrect and may result from conceptual errors.