branch(branch_name, branch_city, assets) customer (customer_name, customer_street, customer_city) loan (loan_number, branch_name, amount) borrower (customer_name, loan_number) account (account_number, branch_name, balance) depositor (customer_name, account_number) Figure 2.15 Banking database for Exercises 2.8, 2.9, and 2.13. Consider the bank database of Figure 2.15. Give an expression in the relational algebra for each of the following queries: a. Find all loan numbers with a loan value greater than $10,000. b. Find the names of all depositors who have an account with a value greater than $6,000. c. Find the names of all depositors who have an account with a value greater than $6,000 at the "Uptown" branch