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gesmundo
Answers (1)
given that V'=2ft^3/min;r=12ft,V=(4pi r^3)/3,S=4pi r^2. dV/dr=4pir^2; dS/dr=8pi r dS/dt=dS/dr x V'/(dV/dr) dS/dt=(8pi r x 2)/4pi r^2=1/3 dS/dt=1/3 ft^2/min
