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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 decreased by $$2\mathrm{.}091$ billion from the end of the previous quarter, and was negativ

b$.$ Is the company's m