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.$)$

$($Click on the following icon $$ in order to copy its contents into a spreadsheet.$)$

$\backslash$table$[[$Balance Sheet,$31-$Mar$-2022,31-$Dec$-2021,30-$Sep$-2021,30-$Jun$-2021],[$Assets$],[$Current Assets$],[$Cash and cash equivalents,$293,300,255,232],[$Net receivables,$401,362,385,460],[$Inventory$,374,342,437,306],[$Other current assets,$60,43,53,45],[$Total Current Assets,$1,128,1,047,1,130,1,043],[$Long$-$term investments,$128,97,-,200],[$Property$,$ plant, and equipment,$979,991,995,1,052],[$Goodwill$,744,748,736,742],[$Other assets,$777,829,920,797],[$Total Assets,$3,756,3,712,3,781,3,834]]$