Find instantaneous rate of change of 7/3z^2

mattsoto
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"Find the instantaneous rate of change of w with respect to z if w=(7/3z^2)"
excuse the primitive equation...any help?
 
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Just http://mathworld.wolfram.com/Derivative.html" it with respect to z.
 
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Is that w= (7/3)z2 or w= 7/(3z2)?

I suspect the former which should be easy to differentiate using
(zn)'= n zn-1. If the latter, write it as w= (7/3)z-2 and use the same rule.
 

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