Answer
$\overline{z}=3+4i$ and $|z|=5$.
Work Step by Step
Of a complex number $z=a+bi$, $\overline{z}=a-bi$ and $|z|=\sqrt{a^2+b^2}$
Hence here, $\overline{z}=3-(-4i)=3+4i$ and $|z|=\sqrt{3^2+(-4)^2}=\sqrt{25}=5$.
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