Find the modulus of each of the following:

Given: $z=(-3-4 i)$

Now, we have to find the modulus of $(-3-4 i)$

So, $|z|=|-3-4 i|=\sqrt{(-3)^{2}+(-4)^{2}}=\sqrt{9+16}=\sqrt{25}=5$

Hence, the modulus of $(-3-4 i)$ is 5