For a join between 2 tables, the table which is writen on the left hamd side of the join is called a left table and a table which is written on the right hand side of the join is called right hand side table. In the given question, if we join student table with course table, the student table is considered as left table and course table is right table.
Also, it is asked in the question to use the right join. Joon will work on the basis of join condition. We need to find the colimn which is common in both student and course relation. The common column is student#.
So, we need to use this column in the join condition. Also, as it is a right join it will return the unmatched rows from the right table which is course table.
select * from student s right outer join course c on s.student_number=c.student_number;