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Chemistry Significant Figure Math Problems?

Perform the following mathematical operations, and express each result to the correct number of significant figures.

(a) 0.25 x 6.022 x 10^23

(b) (4.0 x 10^4) x (5.620 x 10^-3) x (7.34993 x 10^2)

(c) (5.0 x 10^6) / 3.00 x 10^-7

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