S = – 25m2 + 125m, where S is the number of CDs sold in thousands, and m is the number of months that it is on the market.
a. In what month should the music store expect the CD to stop selling?
b. In what month will CD sales peak?
c. How many copies will the CD sell at its peak?

Air pollution: “combustion results in gases such as nitrogen oxides, nitrogen dioxide and particulates. the main causes of air pollution include transport, domestic combustion and industrial processes. pollutants from these sources can cause problems in the immediate vicinity and a distance away.”

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