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Answer :
The weight of 5 × 10^6 dust particles, represented in scientific notation, is 3.71 × 10^-3 kilograms.
Given that the weight of one dust particle is 7.42 × 10^-10 kilograms, we can calculate the total weight of 5 × 10^6 dust particles.
Weight of one dust particle = 7.42 × 10^-10 kilograms
Weight of 5 × 10^6 dust particles = (7.42 × 10^-10 kilograms) × (5 × 10^6)
To multiply numbers in scientific notation, we multiply the coefficients and add the exponents:
Weight of 5 × 10^6 dust particles = 7.42 × 5 × 10^-10+6 kilograms
Weight of 5 × 10^6 dust particles = 37.1 × 10^-4 kilograms
Since 10^-4 can be written as 10^-3, we can express the weight in scientific notation as 3.71 × 10^-3 kilograms.
Therefore, the correct answer is B. 3.71 × 10^-3 kilograms.
Learn more about scientific notation and calculations here: brainly.com/question/30387920
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