The first significant figure is the first number which is not zero (in this case, it is the three). All numbers beyond this are significant. So the third significant figure is the 9. In this case, the number rounds down to 0.0309
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0.000709999 rounded to 3 significant figures is 0.000710
5020 has 3 significant figures. It could also have 4 significant figures if, for example, 5019.6 was rounded to 4 significant figures.
It is 11,600
533000
It is 1570000 rounded to 3 significant figures