Some balance sheet information is shown here

Balance Sheet:	3/31/2019	12/31/2018	9/30/2018	6/30/2018
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	827	909	797
Total Assets	3,756	3,710	3,770	3,834
Liabilities
Current Liabilities
Accounts payable	876	1,467	922	980
Short/current long-term debt	410	2	173	288
Other current liabilities
Total Current Liabilities	1,286	1,469	1,095	1,268
Long-term debt	2,381	2,124	474	475
Other liabilities	435	574	559	551
Total Liabilities	4,102	4,167	2,128	2,294
Total Shareholder's Equity	346	457	1,642	1,540
Total Liabilities and Shareholder's Equity	3,756	3,710	3,770	3,834

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(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