c++ small school test review

hi, i post my past c++ test. want to check myself that i got it done correct. because i dont have anyone to ask for help or to check my answers. i attach files- it says there what has to be done. instructions..: there is no need to write the whole programs only the functions in recursion part and there is a part with questions - its only takes 1..2 sentences to answer no need for big answer.