you can get easy conversions at wolframalpha.com
Just enter you polar values, and you can read off the Cartesian ones. For example,
http://www.wolframalpha.com/input/?i=440+cis+100%C2%B0
It shows the polar value as a complex number, but that's just the x- and y-components.
No doubt there are other handy conversion sites as well. Of course, you could just use your calculator...
Add the following vectors:
440 N at 100 degrees
905 N at 160 degrees
A.1187.7 N at 128.7 degrees
B.1010.4 N at 48.2 degrees
C.1345 N at 130 degrees
D.1013.5 N at 149 degrees
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