Suppose we have the following facts about functions $M$ and $N\text{:}$ $$\begin{aligned} M(3) \amp= 5\\ N(3) \amp= 12 \end{aligned}$$ If we define a new function $$s(x) = M(x) + N(x)$$ then we could evaluate $s(3)$ by merely adding $M(3)$ and $N(3)\text{.}$ Answer: $s(3)$ =