Which forerunner technology enabled its users to have a conversation with other users without creating personal accounts

Part 1:

Part 2:

Explanation:

Part 1: (the book value per share of the preferred and common stock under No preferred dividends are in arrears)

Book value per share of the preferred :

In our case Cumulative dividends=0

Book value per share of the common stock:In our case Cumulative dividends=0

Part 2:

Annual Preferred Dividend=4%*$25*10,000=$10,000

Three years of preferred dividends are in arrears= 3*Annual Preferred Dividend

Three years of preferred dividends are in arrears= 3*$10000=$30,000

Formula for  the book value per share of the preferred is same as above,so we will direct calculate:

In our case Cumulative dividends=$30,000

Book value per share of the preferred :

Book value per share of the common stock:

Formula for  the book value per share of the common stock is same as above,so we will direct calculate: