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Mathematics: Post your doubts here!

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These questions can't be done within seconds, so you have to spend some time to do that.

no I am used to do such Qs but I am sleepy now and have been a month since I've done maths but still I can't be satisfied until I do it ;-)
 
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***amd*** Thank you for your hard work.
BTW you forgot to write the question no. It's 9.b(i).
In IGCSE Maths on the first page it is written "If the degree of accuracy is not specified in the question, and if the answer is not exact, give the answer to three significant figures. Give answers in degrees to one decimal place."
It is better although it may be not necessary if you write 1744 in 3 sig.fig.
So it will be 1740
But if a question tells you (eg. give the answer correct to 2 d.p), then you should do that.
 
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