Evaluating Functions - Examples & Practice

$$\begin{array}{c|c} A&B\\ \hline f(x)=2^z-4x&g(x)=z^2+8x \end{array}$$

It is your last turn in a card game, and you are deciding which of two cards to play. Card A would add $f(12)$ points to your score while Card B would add $g(12)$ points.

The catch is, you won't know the value of $z$ until after you play a card. After you have chosen which card to play, you will roll two fair six-sided dice (numbered 1 through 6) and take $z$ to be the sum of the two rolls.