Question: please help ASAP!!! -1) Is it true that there are two sig figs in 46000 , three sig figs in 40600 , four sig fig

please help ASAP!!!

-1) Is it true that there are two sig figs in 46000 , three sig figs in 40600 , four sig fig in 0.004600 ? Explain, why? 2) The answers with correct sig figs for 25.541+3.2 is 28.7 (three sig figs) but for 25.3213.2 is 81 (two sig figs). Why? 3) Check this conversion and comment on sig figs of the answer. is it correct, why? 4.52kg=4.52kg1000g/kg=4520g

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