75. A company is dumping pollution into a lake at a rate that is increasing at a constant rate from 10 kg/year (when dumping began) to 50 kg/yr. At this point a total of 270 kg has been dumped into the lake. Sketch a graph of the rate at which pollution is being dumped in the lake against time. How long did it take the company to dump the 270 kg of pollution?

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