2- two brothers must complet two different tasks before going to a concert. One brother completes one of the tasks and the other brother completes the other task. What economic concept does this statement BEST represent?

3- individual has one hour to spend on completing an assignment. The consumer could choose a second activity at a wage of $9 or the consumer could choose a third activity at $14 per hour. If the individual chooses to complete assignment, what is the opportunity cost?

4- two individuals are roommates at college and are faced with choice of cooking or cleaning. Individual 1 hates cooking. Individual 2 will do the cooking if Individual 1 does the cleaning. What economic concept does this statement BEST represent.

Please give me the correct answer.