Question 976132
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If the radius is increasing at a rate of 3 cm per second, then *[tex \Large r\ =\ 3t].  Substitute *[tex \Large 3t] for *[tex \Large r] in *[tex \Large 4\pi{r^2}]


John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it

*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \