SOLUTION: A spherical weather balloon is being inflated. The radius of the balloon is increasing at the rate of 3 cm per second. Express the surface area of the balloon as a function of time

Question 976137: A spherical weather balloon is being inflated. The radius of the balloon is increasing at the rate of 3 cm per second. Express the surface area of the balloon as a function of time t (in seconds). If needed you can enter \pi as pi. Recall surface area of a sphere is 4*pi*r^2 .
please give answer (last tutor did not)
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
, your surface area formula, variable being r.

Chain Rule is used because radius r is a function of time, and using t for time variable.

Your example specifically specified, , in cm squared per second.
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