The following table gives the number of stores and the amount of sales (in millions of dollars) for the leading U.S. pizza chains in 2013.
(a) Obtain the least-squares line that fits these data. (Let x represent the number of stores in thousands.)
(b) Use the equation from (a) to estimate the 2013 sales for a pizza chain having 4000 stores.
(c) Use the equation from (a) to estimate the number of stores for a pizza chain whose 2013 sales were 2000 million dollars.

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Number of Stores 6326 4986 Sales (in Millions of Dollars) Pizzeria Pizza Hut Domino's 5700 3800 3890 3207 3025 2485 Little Caesars Papa John's