"Find the instantaneous rate of change of w with respect to z if w=(7/3z^2)" excuse the primitive equation...any help???
Is that w= (7/3)z^{2} or w= 7/(3z^{2})? I suspect the former which should be easy to differentiate using (z^{n})'= n z^{n-1}. If the latter, write it as w= (7/3)z^{-2} and use the same rule.