Please help with the following database question

Q.4 Consider the following schema for a car rental database. Customers (CustID, LastName, FirstName) Cars (CarID.CarMake) Orders (OrderID,CarID, CustID, NrOfReqs) Rentals (CustID.CarID,CheckoutDate.Duration) Write SQL statements for the following queries regarding the car database: a) Find the customers who have rented cars for 5 days or more (list the last names) b) Find out the make of the cars for which a total of at least 10 requests have been made. c) Find the average rental duration for each customer (report the result using last names) d) Find the ID and make of the cars that have been rented for at least 1 day and have not been ordered by customer with ID 111