Can someone me on drawing er and use case diagram on following scenarios.

* develop a system to automate membership details and time allocation for swimmers in a swimming club. all users should take membership and pay monthly for usage. usage could be with a coach or without.

* part of the process of course registration at ousl for a new applicant

when an applicant requests to register for a course, an officer from student affairs verifies whether he/she has relevant entry qualifications and paid the fees. if certificates to show entry qualifications are not brought the applicant is asked to bring them and return. if the fees are not paid the applicant is directed to the finance division to make the payment and come. to register for a course, the system checks whether the course prerequisites are satisfied and let the student register for the particular course.
a student is given a student id number and a registration number for the particular programme. all courses have unique course codes, titles, credit ratings and a set of pre-requisites.

For each of the following claims, determine whether they are true or false. justify your determination (show your work). if the claim is false, state the correct asymptotic relationship as o, θ, or ω. unless otherwise specified, lg is log2.(a) (b) (c) (d) (e) (f) (g) (h) (i) (j)n+1 =22n =2n =1 =ln2 n =n2 +2n−4 =33n = 2n+1 =√n = 10100 =o(n4) o(2n)θ(2n+7 ) o(1/n)θ(lg2 n) ω(n2 )θ(9n ) θ(2n lg n )o(lg n) θ(1)

Ihave a music player on my phone. i can buy songs, add them to playlists and play them. obviously it would be redundant to store each song in each playlist; each playlist is just a list of pointers to the songs. for this lab you will simulate this behavior. your program will need to have options to: add songs to the system library (you will store the text of the first line of the song, rather than the audio) add playlists add songs to a playlist list playlists play a playlist list all of the songs in the library with a count of how many times each song has been played remove a song from a playlist remove a playlist remove a song from the library (and thus from all playlists that contain it) note that we will not be checking many error cases. in real programming this would be bad, you should usually try to recognize and respond to as many types of errors as you can. in the context of class we are trying to acquaint you with as many concepts as possible, so for the sake of educational efficiency we will not be checking most errors in this lab, you may assume that your user provides correct input. you may add all appropriate error testing if you wish, but we will not be testing for it.

Who is the first president to use social media as part of his campaign strategy