please solve for a and b

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 2021? 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 2021? The book value of equity by $ billion from the end of the previous quarter, and was (Select from the drop-down menus and round to three decimal places.) Balance Sheet 31-Mar-2022 31-Dec-2021 30-Sep-2021 30-Jun-2021 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 2021? 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 2021? The book value of equity by $ billion from the end of the previous quarter, and was (Select from the drop-down menus and round to three decimal places.) Balance Sheet 31-Mar-2022 31-Dec-2021 30-Sep-2021 30-Jun-2021