Database relational algebra

Given the following database schema E - Employee (Ename, SSN, Age, salary, Supervisor_SSN, Dno) D Department (Dname, Dnumber, Dlocation, Manager_SSN, Mgr_StartingDate) P Project (Pname, Pnumber, Plocation) W- Works_On (ESSN, Pno, Hours) De Dependent (ESSN, D name, DoB, Relationship) and the following set of foreign keys: EmployeeSupervisor-SSN EmployeeSSN Employee,Dno DepartmentDnumber DepartmentManager. SSN Employee .SSN works_ON.ESSN Employee.SSN works-On.Pno ProjectPnumber Dependent.ESSN Employee.SSN d. Return the names of those who have the lowest salary among all employees whose age is between 35 and 40; Find the names of employees whose salary is higher than that of his/her supervisor; e