# In scientific notation, what is the sum of 2.3 times 10^{-3} and 5.4 times 10^{-4}? a. 2.84 times 10^{-3} b. 5.63 times 10^{-3} c. 7.7 times 10^{-7} d. 12.42 times 10^{-12}

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