In early 2015, Ford Motor (F) had a book value of equity of $24.6 billion, 3.1 billion shares outstanding, and a market price of $16.09 per share. Ford also had cash of $21.8 billion, and total debt of $117.5 billion. Three years later, in early 2018, Ford had a book value of equity of $35.6 billion, 4.1 billion shares outstanding with a market price of $11.84 per share, cash of $26.7 billion, and total debt of $159.1 billion. Over this period, what was the change in Ford's

a. market capitalization?

b. market-to-book ratio?

c. enterprise value?