Please check if the first 2 are correct and need help with the last one

Question 2 (Total 5 Points): er to Schema diagram of University database, Write the relational algebra expressions for the following Hint: Use Projection TT and selection 2.1 c2 Points) Find the name and salary of all instructors in the chemistry department parment chemis 2.1 (2 Points) Find the name of all students with tot_cred > 10 total cred lo Studend name 2.3 (1 Point) For the following relational algebra expres sion, explain the output of the expression in word TTcourse_id ( semester-Fall"A year-2009 (section)) course_id ( semester-Spring"A year-2010 (section))