Mia opens a coffee shop in the first week of january.  the function  w(x) = 0.002x3  - 0.01x2  models the total number of customers visiting the shop since it opened after  x  days.  she then opens an ice cream parlor in the month of february.  the function  r(x) =  x2  - 4x  + 13  models the total number of customers visiting the parlor since it opened after  x  days.  which function represents the  difference,  d(x), in the number of customers visiting the two shops? d(x) = 0.002x3  + 1.01x2  - 4x  + 13d(x) = 0.002x3  + 0.99x2  + 4x  - 13d(x) = 0.002x3  - 1.01x2  + 4x  - 13d(x) = 0.002x3  - 0.99x2  - 4x  + 13