Mia opens a coffee shop in the first week of JanuaryThe function Wx)=0.002x^ 3 *0.01x^ 2 models the total number of customers visiting the shop since it opened after xdaysShe then opens an ice cream parlor in the month of February. The function R(x) = x ^ 2 - 4x + 13models the total number of customers visiting the parlor since it opened after x days. Which function represents the difference, D(x) the number of customers visiting the two shops?