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Analyzing related rates problems: equations


Zhenghao was given this problem:
The radius r, left parenthesis, t, right parenthesis of a sphere is decreasing at a rate of 1 meter per hour. At a certain instant t, start subscript, 0, end subscript, the radius is 4 meters. What is the rate of change of the volume V, left parenthesis, t, right parenthesis of the sphere at that instant?
Which equation should Zhenghao use to solve the problem?
Choose 1 answer: