### Instruction: Let $r=3^s-s$ and $s=2^n+1$. What is the value of $r$ when $n=2$?### Response: To find the value of $r$ when $n=2$, I need to first plug in $n=2$ into the expression for $s$ and simplify.
That gives me $s=2^2+1=4+1=5$.
Now that I have $s=5$, I can plug that into the expression for $r$ and simplify again.
That gives me $r=3^5-5=243-5=238$.