Physics, Chemistry and Biology: Post your doubts here!

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Hello pls I have simple question that has been confusing me for a while about PHYSICS AND CHEMISTRY. In marking scheme the answer is sometimes rounded off to one dp or two sig figures, we were always told to round off to three sig figures..now which sig fig/dp should I round off??
 
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Hi again Anon.....Ive been seein u around lately....
Now cn u also solve this problem for me pls????? ^-^
A uniform metre ruleof weight 0.9N is suspended horizontally by 2 vertical loops of thread A and B placed at 20cm and 30cm from its ends respectively. Find the distances from the centre of the rule at which a 2N weight must be suspended:
i) to make loop A become slack
ii) to make loop B become slack
Hi every one here. Please any one can help for this question?
 
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