The equation given above can also be written as,
                f(x) = (4x - 3)/2
Then, we replace f(x) with y giving us with,
                 y = (4x - 3)/2
Next, we interchange the variables such that we will be left with the equation,
                 x = (4y - 3)/2
Then, we solve for the value of y using the new equation,
                  2x = 4y - 3
                2x +3 = 4y - 3 + 3
                 2x + 3 = 4y
Â
               (1/4)(2x + 3) = (4y)(1/4)
                 (2x + 3)/4 = y
The inverse function isÂ
Â
                   y = (2x + 3)/4
Substituting 30 to the value of x,
                 y = ((2)(30) + 3) / 4 = 30.75
Thus, the assignments that have to be finished is approximately only 30.Â