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C = 20t^2 + 135+ + 3050, where C is the number of new cars and t = 0 corresponds to the number of new cars purchased in 1998. In what year will the number of new cars purchased reach 15,000?

 Jul 29, 2020
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15000 = 20 t^2 + 135t + 3050       is '3050' correct?      And I assume that is 135 t    not 135 + 

 Jul 29, 2020

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