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Mathematics 8 Online
OpenStudy (anonymous):

with two smoke stacks d miles apart, the concentration of the combined on the line joining them, at a distance x from one stack, is given by S=cx^-2+9c(d-x)^2 find minimum distance.. help!

OpenStudy (anonymous):

I have it down to solving S' for values of x and d. d=3.080083823x, x=d/3.080083823

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