Firstly I am very happy to get this beneficial app as a student , this is really good app and I will recommend it to my friends too.
I just want to correct a mistake which is in answer (iv) The coordinates will be (11/3 , 11/3) not (11/2 , 11/2). 
The students who copy without understanding the solution will surely need this otherwise their (iv) solution marks will be deducted. 
Thanks