At the end of the holiday season in January the sales at a department store are expected to fall It is estimated that for the x day of January the sales will be 16 S x 3 thousand dollars x 1 a Find the total sales for January 9 and determine the rate at which sales are falling on that day b Compare the rate of change of sales on January 3 to the rate on January 9 What can you infer about the rate of change of sales a The total sales for January 9 were thousand dollars Sales y 4 Days in January