i am stuck on the following problem. here is a pic of the problem

http://imgur.com/ydSuUL9

please include all work/steps in the answer

thanks in advance

y= 2/ (5x^3) = 2/5 * x^-3

dy/dx = 2/5 * -3 * x ^-4

= -6/ (5x ^4)

When x=4, dy/dx = -6/ (5* 4^4)

= -6/1280

= -3/640

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