The number of adults who attend a county fair (measured in hundreds of people) is represented by the function a (d) = - 0.3d2+4d+9, where d is the number of days since the fair opened. The number of children who attend the same county fair (measured in hundreds of people) is represented by the function c (d) = - 0.2d2+5d+11, where d is the number of days since the fair opened. What function, f (d), can be used to determine how many more children than adults attend the fair on any day?
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