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What was the answer to that? I put D because I thought the town would put nutrients into the water and increase the biochemical demand and lower dissolved oxygen, and the quarry would increase pH since limestone is alkaline. But someone else reckons it is A. What does everyone else think.

I did four unit and according to what our teacher told us, the integral in question 4 was biased toward four unit students. Our teacher said that in three unit you aren't expected to work out the substitution and that it would be given to you, but in four unit you are. So I looked at it and...