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Mathematics, 08.01.2020 19:31 staz13wiggins

Let u=(5,-12) and c=-3 what is || cu || ? a.-39 b.21 c.39 d.51 i need badly

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Let u=(5,-12) and c=-3 what is || cu || ? a.-39 b.21 c.39 d.51 i need badly...
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