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Mathematics, 21.06.2019 21:00
The? half-life of a radioactive substance is 20 years. if you start with some amount of this? substance, what fraction will remain in 120 ? years
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Mathematics, 21.06.2019 22:30
Which of the following would be a reasonable estimate for the weight of a pencil? a. 1 × 10^-20 lb b. 1 × 10^20 lb c. 1 × 10^2 lb d. 1 × 10^-2 lb
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Mathematics, 21.06.2019 23:00
Of the 304 people who attended a school play, 5/8 were students. how many of the people who attended were students.
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History, 13.07.2019 16:50
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Mathematics, 13.07.2019 16:50