Find | vec a | for vec a = (5, -12).

Find $∣ a ∣$ for $a = (5, - 12)$ .

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Find $∣ a ∣$ for $a = (3, - 4)$ .
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For $a = (2, - 5)$ and $b = (0, 3)$ , find $a \cdot b$ .
For $a = (5, - 2)$ and $b = (- 2, - 1)$ , find $a \cdot b$ .