please help me do these questions of database

Problems 1. (3 points) Consider the following relations, R,S and T. Show the results of the following queries: a) M1b(T) b) M2RS c) M3RS d) M4ST e) M5SS.a=T.bS.a>cT f) M6ST 2. ( 1+1 points) Consider the following relations: product (pid, pname, price, makercid) purchase (buyerID, pid) company (cid, cname, country) person (ID, name, phone) Write the following queries in relational algebra: a) Find the buyerID of people who did not purchase any product with a price greater than 200. b) Find the pid of those product that are made in USA or were purchased by Tom Smith