Chapter 2 - Section 2.3 - Functions - 2.3 Exercises - Page 200: 46

$f\left( -\dfrac{7}{3} \right)=11$

Substituting $x$ with $ -\dfrac{7}{3} $ in the given function, $ f(x)=-3x+4 ,$ then, \begin{array}{l}\require{cancel} f\left( -\dfrac{7}{3} \right)=-3\left( -\dfrac{7}{3} \right)+4 \\\\ f\left( -\dfrac{7}{3} \right)=7+4 \\\\ f\left( -\dfrac{7}{3} \right)=11 .\end{array}