Can you help me explain detail the question?

1 Sun Airlines, Inc., prints on its tickets that it is not liable for any injury to a passenger caused

by the airline's negligence. If the cause of an accident is found to be the airline's negligence,

can it use the clause as a defense to liability? Why or why not?

2. Greg contracts to build a barn for Haney, who pays Greg in advance. Greg completes only

half of the work. Haney pays Ipwich $5,000.00 to finish the barn. If Haney Sue's Greg, what

will be the measure of recovery?