Chemistry help please!!!!!!!!!!!10 pts!?

1

115226258

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1. 0.14 x 6.022 x 10^23
2. 4.0 x 10^4 x 5.021 x 10^-3 x 7.34993 x 10^-2
3. (2.00 x 10^6) / (3.00 x 10^-7)

Please express your answers in significant figures.Thanks!
 
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