Evaluate the following function for the input given below:

1. `f(6)` when `f (x) = (x^2-4+x)/(9x-7)`.

   `f(6)=`   s

2. `g(-4.5)` when `g (x) = (-2x^2+1.1x-2(7-x))/(8.4-4x)`.

   `g(-4.5)=`  

3. `g(m)` when `g (x) = 2/3x-6x^3+x (x+6)`.

   `g(m)=`  

4. `f(x+2)` when `f (x) = 2x^2+7x-15`.

   `f(x+2)=`