What is the **modulus** $|z|$ of $z = 3 + 4i$?
A$7$
B$\sqrt{7}$
C$25$
D$5$
Answer & Solution
Correct answer: D. $5$
$|z| = \sqrt{a^{2} + b^{2}} = \sqrt{9 + 16} = \sqrt{25} = 5$.
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