Given that $y=3$, evaluate $(1+y)^y$.
I need to plug in $y=3$ into the expression $(1+y)^y$ and simplify. That gives me $(1+3)^3 = 4^3$. I know that $4^3$ means $4 \times 4 \times 4$, which is $64$. So $(1+y)^y = 64$ when $y=3$. 