6. A spherical snowball is melting in such a manner that its radius is changing at a constant rate, decreasing from 27 cm to 17 cm in 30 minutes. At what rate, in cm3 per minute, is the volume of the snowball changing at the instant the radius is 1cm? 2n A. 3 4 В. 3 C. 3 26л D. 3 E. -- F. None of these

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