Destroyer QR #20, #27

[tgutberg]

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Hi
I do not under understand the difference between question #20 and question #27. Why is a different formula used? I am not clear on whether each should be used.

Thanks,
Tom

 

[Lily-VA]

hmm...

 

[Streetwolf]

http://forums.studentdoctor.net/showthread.php?t=424904