Plz solve according to significant figure rule in chemesrty

Dear student,

6.28 x 10-5 / ( 2 x 10-3)2

= 6.28 x 10-5 / 4 x 10-6

=​​​​​
1.57 × 10-5+6
= 1.57 ×10=15.7
Thus there are 3 significant figures.


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