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Vector operations please check this for me thanks

Given vector v with /v/ = 4 and direction angle of 45 degrees, write v in the form <a,b>
a= 4cos 45 degrees= 4*.707=2.83
b= 4sin 45 degrees= 4*.707=2.83
vector v (a,b) becomes v(2.83, 2.83)

compute (2*w).(u-v) where w = <-1, 0>
2(2<100)(5<60-4<45)
2*2<180*1.536<102.5
=6.144<282.5 or 6.144<-77.5degrees
vector from equation is it
R(1.33,-6.00)

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2(2&lt;100)(5&lt;60-4&lt;45) should be replaced by ...

$2.19