Given the following COMPANY relational database schema, answer the following questions: Q7. Using relational algebra, retrieve the names of employees in department 5 who work more than 10 hours per week on the 'ProductX' project. [4 points] Q8 - Using SQL, retrieve the names of all employees who are not supervisors [3 points] Q9 - Using SQL, retrieve the names of all employees who work in the departments that have the employee with the lowest salary among all employees, [3 points]