Can someone explain to me the following ALU diagrams?

[Rayza16]

http://commons.wikimedia.org/wiki/Computer_diagrams#ALU_operation_modes


Can you explain them individually? Please, I really need to know what they mean.

 

[chrisalviola]

why is that your homework?

 

[Rayza16]

Yea, for a project I need to do.