If $\&x$ is defined as $\&x = x + 5$ and $\#x$ is defined as $\#x = x^2$ , what is the value of $\#(\&4)$?
I need to find the value of $\#(\&4)$, which means I need to apply the $\#$ operator to the result of applying the $\&$ operator to $4$. To do that, I first need to evaluate $\&4$, which means I need to add $5$ to $4$. So, $\&4 = 4 + 5 = 9$. Now, I need to apply the $\#$ operator to $9$, which means I need to square $9$. So, $\#(\&4) = \#9 = 9^2 = 81$. 