<-Link#30 (Magnitude=IIvII=3, direction=u=<4,-4>=4i-4j)

<-#48(IIvII=3, u=3i+4j)

<-#64(magnitude=70lbs, 40lbs, 60lbs; @-30deg, 45deg, 135deg)

<-#74(velocity=580mph @ N60degW, wind=SW @ 60mph)

http://hmco.tdlc.com/precalc/tdlc/www_precalc.htm#

If you could go to CH6 then Section 1 then Exercises. #30 is giving me trouble

:( plz&thx