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How many significant figures are there i...

How many significant figures are there in each of following number: (i) 0.437 (ii) 935100 (iii) `2.158xx10^(4)`
(iv) 0.00839 (v) 207.39 (vi) 17.00 (vii) `2.0100xx10^(4)`
(viii) `6.0xx10^(23)`
(ix) 0.00070

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(i) 3 significant figures (4,3,7), (ii) 4 significant figures (9,3,5,1), (iii) 4 significant figures (2,1,5,8), (iv) 3 significant figures, (8,3,9), (v) 5 significant figures (2,07,3,9), (vi) 4 significant figures (1,7,0,0), (vii) 5 significant figures (2,0,1,0,0), (viii) 2 significant figures (6,0), (ix) 2 significant figures (7,0).
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