Using the provided database answer the questions using relational algebra

classroom building string room_number number capacity number department dept_name string building string budget number course course_id string title string dept_name string credits number instructor ID number name string dept_name string salary number section course_id string sec_id number semester string year number building string room_number number time_slot_id string teaches ID number course_id string sec_id number semester string year number student ID number name string dept_name string tot_cred number takes ID number course_id string sec_id number semester string year number grade string advisor s_id number i_id number time_slot time_slot_id string day string start_hr number start_min number end_hr number end_min number prereq course_id string prereq_id string 7. Course(s) (course_id(s) and title(s)) that was were offered in the Spring 2010 semester. 8. Course (s) that are a prerequisite to some course(s). We are interested in course_id(s) only. 9. Course(s) with prereqisite(s) from other departments. We are interested in course id(s), title(s) and dept name(s) of a course with its prerequisite's course_id(s), title(s) and dept_name(s). 10. Students who received grade A for course CS-190 in the Spring 2009 semester. Retrieve ID(s) of student(s) along with their name(s)