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When a new cellphone is put on the market, the demand each month can be described by the functionwhere C ( t ) represents the

When a new cellphone is put on the market, the demand each month can be described by the functionwhereC(t) represents the demand of the cellphone (measured in millions of people) and the time,t, is measured in months. Which of the following solution(s) are valid for a positive demand?

A. (2,3)

B. (6,3)

C. (3,0) and (7,0)

D. (-2,3) and (6,3)

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