A simple system is to be designed to allow for the selling of old books. There are two different types of users: buyers and sellers. All users are registered externally from the system. The sellers can post information on the books they have for sale and remove the books once they are sold. Buyers can search the system and then contact a seller offline if they want to make a purchase. Using problem, draw the UML Use Case Diagram, and write the stories for each use case above.

Leo is a recruitment executive for a large company. he has identified new labor resource requirements in both the marketing and production departments. what should be his first step in recruiting candidates for the positions? a. conduct background checks of candidates b. make job offers c. arrange interviews d. conduct reference checks e. place job ads on job sites

Write a defining table and then a program that determines if you can sleep in or not. your program should get all its input from your computer’s clock. on all weekdays (monday through friday) that are not holidays, your program should output “get up! ” on all other days (weekends and holidays), your program should output “sleep in.” the three holidays that your program must check for are january 1 (new year’s day), july 4 (u.s. independence day), and december 25 (christmas). you don’t need to include other holidays in your program because most other holidays do not occur on a fixed day each year.

You're programming an infinite loop. what must you include in your code to prevent crashes? in roblox