Let \( f(x)=3 x+4, g(x)=2 x+1 \), and \( h(x)=6 x^{2}+11 x+4 \). Write a formula for each of the following functions and then simplify. a. \( (f h)(x)= \) b. \( \left(\frac{h}{f}\right)(x)= \) c. \( \