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

d. (3.8 x 10^{-12} + 4.0 x 10^{-13}) / (4 x 10^{12} + 6.3 x 10^{13})

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Our data indicates that this problem or a close variation was asked in Chemistry - Zumdahl 7th Edition. You can also practice Chemistry - Zumdahl 7th Edition practice problems.