The rule when rounding off numbers is "If the first figure to be discarded is 5 or more then the previous figure is increased by 1".
The first figure to be discarded is '6' and as this is greater than 5 then the previous figure (4) is increased by 1 (to 5).
29.46 when rounded off to three significant figures is 29.5.
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Three significant figures would be 29.5cm.
3.738mL, when rounded to three significant figures, is 3.74mL
It rounds to 3.74mL
79,966.92 rounded to three significant figures is 8.00e4
1,399.54 rounded to three significant figures is 1.40e3