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OpenStudy (anonymous):
A spherical weather balloon is being inflated. The radius of the balloon is increasing at the rate of 2 cm/s. Express the surface area of the balloon as a function of time t (in seconds).
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OpenStudy (anonymous):
Okay so I know the formula to find surface area of a sphere is 4 pi r^2... and r=2t ..time=seconds... so is the answer 4 pi (2t)^2??? Can I simplify it ?
zepdrix (zepdrix):
Hmmmmm :\
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