
Mike D. answered 09/04/20
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Olesya
6.450e 18 has 4 significant figures (6,4,5,0)
5.291 e 6 also has 4 (5,2,9,1)
So you report the answer to 4 significant figures
answer is 1.219051219 e 12
so you report answer as 1.219 e 12
Mike