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Algebra 8 Online
OpenStudy (anonymous):

A scientist want to estimate the volume of Earth and uses a sphere as a model for the planet. According to NASA, Earths diameter is 12,756 km. The volume of a sphere four-thirds of the produce of PI (π) and the radius cubed. Using 3.14 for π and that the radius of a sphere is equal to two times its diameter, estimate the volume of Earth.

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