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converting a fraction to a termination decimal: basic

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On a piece of paper graph f(x)=5•(0.4)^x

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?