Please answer 7-10

tables below to answer questions 6-10. instructor teaches ID name course i sec idsemester wwar 2009 salary 10101 Srinivasan Comp. Sci. 65000 Finance 90000 40000 2121 Wu 15151 Mozart Music 10101 CS-101 Fall 10101 CS-315 1 Spring 2010 2009 22222 Einstein Physics 95000 32343 El Said History 60000 10101 CS-347 1 Fall 12121 FIN-201 Spring 2010 Spring 2010 151 MU-199 22222 PHY-101 1 Fall 2009 6. and the course id. Find the names of all instructors in the Art department who have taught some course Write the query using SQL. 7. Find the names of all instructors with salary between $90,000 and $100,000 (that is, 2 $90,000 and s $100,000) 8. Find the average salary of instructors in the Computer Science department. 9. Find the number of tuples in the course relation. 10. Find the salaries of all instructors that are less than the largest salary