(i)  In order for to write the inverse function, let's denote the resulting number by "y"


     After that, write the arithmetic and algebraic operations in reverse order,
     starting from y.


       - Multiply "y" by 2, getting 2y;

       - divide 2y by 3, getting ;

       - take the square root from it, getting  ;

       - subtract 4 from it, getting  .


     It is your inverse function  x = .    ANSWER

     It allows you calculate the starting number x from the resulting number y.



(ii)  To determine the starting number, use this function with the value y = 50.

      You will get  x =  =  =  = 1.773502692...    ANSWER