if you can make a short answer that will be great

9. Is multiprogramming more useful in a multiuser system or a single-user system? Discuss your arguments. 10. A system has several processes that request I/O services in long time intervals compared with very short CPU service. For example, the processes request services that about 95 percent of the total service request time are I/O requests and only 5 percent are CPU requests. What potential problems can this system exhibit? Explain. 11. A system has several processes that request CPU services in long time intervals compared with the I/O service. For example, the processes request services that about 95 percent of the total service request time are CPU requests and only 5 percent are I/O requests. What potential problems can this system exhibit? Explain