Some balance sheet information is shown here (all values in millions of dollars). a. What change in the book value of the company's equity took place at the end of 2018? b. Is the company's market-to-book ratio meaningful? Is its book debt-equity ratio meaningful? Explain. a. What change in the book value of the company's equity took place at the end of 2018? The book value of equity by $ bilion from the end of the previous year, and was (Select from the drop-down menus and round to three decimal places.) Data table