I need some help on this , please

Explain the difference between how fork() and vfork() UNIX system calls calls work, from Virtual memory- management prospective, i.e., explain how the way these system calls work affects how the memory management system deals with them. Assume the following page reference sequence.(1, 2, 3,,6, 2, 3,4, 5,6, 1, 2, 1,6, 7). Calculate the number of page faults as well as the content of the memory frames at the end of the references for the following 6 cases (scenarios): the memory system contains 1, 2, 3,4, 5, or 6 frames. Draw curse that show Number of Frames on the X axis and number of page faults on the Y axis. Show your work in a separate page of paper