use relational algebra

Consider the bank database given below: branch (branch name, branch_city, assets) customer (customer_name, customer_street, customer_city) account (account number, branch_ name, balance) loan (loan number, branch_ name, amount) depositor (customer name accoum number) borrower (customer name, loan mumber) Give an expression in the relational algebra for each of the following queries: 1- Find the names of all branches from located in "Chicago", (1 point) 2- Find each loan number with a loan amount greater than $10000 and branch name "Downtown" and assign the result to A. (1 point 3- Find all accounts with balance graeter than $6000 and assign the result to B. ( 1 point) 4- find out the loan number from loan where amount >$20000 or branch name ="Uptown" and assign the result to R. (1 point)