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Mathematics 7 Online
OpenStudy (anonymous):

Erosion wears away a boulder at the rate of 0.003t^(1/2) kg per year, where t is in years since the boulder first broke off of a cliff. If it has been 21000 years since the boulder broke away and the current mass of the boulder is 3.5 times 10 ^3 kg, what was the boulder's original mass?

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