Please help me with this database relational algebra(for example, I need answer to have this format. "concat(Fname, Lname)->fullname,Bdate,Sex Super_ssn=333445555 (Employee)" questions refer to the table given below. Thank you

1) Provide the average number of people that have been on each flight number.

Hint Project the difference of the total number of seats less number of available seats. Use the arrow notation -> to assign this a virtual column name. Then take the average.

2) What is the most expensive restricted flight. Show a single result using the appropriate math function (use Gamma operator).

3) List the ids and number of seats for all airplanes that can land at any of the airports in California

4) List all airplane types that can land at any airport in Las-Vegas

AIRPORT Airport code Name City State FLIGHT Flight_number Airline Weekdays FLIGHT_LEG Flight number Leg_number Departure_airport_code Scheduled_departure_time Arrival_airport_code Scheduled arrival time LEG INSTANCE Flight_number Leg_number Date Number_of_available_seats Airplane_id Departure_airport_code Departure_time Arrival_airport_code Arrival time FARE Flight_number Fare_code Amount Restrictions AIRPLANE TYPE Airplane_type name Max_seats Company CAN LAND Airplane type_name Airport_code AIRPLANE Airplane_idTotal_number_of_seats Airplane_type SEAT RESERVATION Flight number Leg_number Date Seat_number Customer_nameCustomer_phone