Answer
1
Work Step by Step
We are asked to find $(f∘f)(4)$. We know that $(f∘f)(x)=f(f(x))$.
Therefore, $(f∘f)(4)=f(f(4))$.
From the first table, we see that $f(4)=3$. From the first table, we see that $f(3)=1$.
Therefore, $f(f(4))=f(3)=1$.