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Mathematics, 20.08.2019 03:30 haileymaree

Historians estimate that there were about 7 million people on the earth in 4,000 bce. now there are about 7 billion! we write 7 million as 7,000,000. we write 7 billion as 7,000,000,000. how many times more people are there on the earth now than there were in 4,000 bce?

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