Need answer on this quickly

Anurse is giving instructions to a client who's going home with a cast on his leg. which teaching point is most critical?

Astudy shows that an influenza vaccine is 71.4% effective in preventing a particular type of influenza. if 15,422 people receive the vaccine, how many would not be protected and would be likely to get infulenza?

What is the difference between drug misuse and drug abuse?