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How old is Earth according to the geological time scale? A. 290 million years old B. 542 million years old C. 2.5 billion years old D. 4.6 billion years old
asked
Feb 5, 2017
Chemistry
high-school
2
answers
4
votes
174k
views
Give an example of a repeating decimal where two digits repeat
asked
Feb 2, 2017
Mathematics
middle-school
2
answers
2
votes
127k
views
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