Let z and w be complex numbers satisfying...

Let z and w be complex numbers satisfying $|z| = 4$ and $|w| = 2$. Enter in the numbers

$|z+w|, |zw|, |z-w|, \left| \dfrac{z}{w} \right|$

below, in the order listed above. If any of these cannot be uniquely determined from the information given, enter in a question mark.