11. (10 points) Given the problems with the supply chain after the pandemic, Flow-More is trying to find the best way to predict the cost of the purchasing function. They just started to gather information, and only have data for the last ten months of 2022. The data, regression results, and scatterplots are below: A. (4 poirits) Determine the formula for the total cost function. B. (6.points) Should all of ony of the independent variables be used to determine the cost of the purchasing department? Why or why not? Consider the regression and the scatterplots on the next page in your answer - Dollar Value of Merchandise Purchased - Number of Purchase Drders. Numbeir of Suppliers