The school store has 2200 pencils in stock and sells an avarage of 40 prncils per day. The manager recorders when the the number of pencils in stock is 840.In the problem the pencils are the:In this problem the days are the:
The number of pencils sold depends on the number of days elapsed. Also, the number of days elapsed determines when the manager has to reorder pencils. Then, the pencils are the dependent variable and the days are the independent variable.
