Can someone help with 17?, I seem to be half right on all. All help appreciated 
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I didnt actually use quotient rule, but yeh u can use quotient ruleSo for part (iii), do u just use quotient rule to differentiate and go from there?
All makes sense now, thanks heaps!!
For part (iii), how do u go get dP/dt = P^2 (1000-P/P)? Everything above I get.