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  3. 2 a lake is polluted with toxic substance x each...

Question: 2 a lake is polluted with toxic substance x each...

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2. A lake is polluted with toxic substance X. Each year, 55% of the remaining substance X is washed downstream and replaced by clean water. Initially, the lake water contains substance X at a level of 420 parts per million (ppm). (a) Fill in the table giving L, the remaining level of substance X, after n years. 10 し1420 (b) Draw the graph of L 189 400 300 200 100 1 23456789 10 (c) Write an expression for L as a function of n.
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