Digital ACT Math Practice Question #1317
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Recognize standard Pythagorean triples: $5-12-13$. The modulus is instantly $13$.
The modulus of a complex number $z = a + bi$ is defined as $|z| = \sqrt{a^2 + b^2}$. $$|z| = \sqrt{5^2 + (12)^2} = \sqrt{25 + 144} = \sqrt{169} = 13.$$...
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