Vector and direction angle

Please show me the steps Tahnk You
A. write u in the form <a , b>

B.Compute (2*u).v, where v=<sqrt(3) , -3>

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https://brainmass.com/math/vector-calculus/vector-direction-angle-13470

Please see the attachment.

given vector u with /u/=9 and direction angle of 30 degrees ...

This shows how to write a vector in a specified form and compute the direction angle.

$2.49