Question 1142694
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{{{V = (4/3)(pi)(r^3)}}}
{{{dV/dt = ((3)(4/3)(pi)(r^2)) (dr/dt) = (4(pi)r^2) (dr/dt)}}}
{{{dr/dt = (dV/dt)/(4(pi)r^2) = 2/(4(pi)r^2) = 1/(2(pi)r^2)}}}