SOLUTION: the number of new cars purchased in a city can be modeled by the equation C=20t2 + 135t + 3050, where C is the number of new cars and t =0 corresponds to the number of new cars pur

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Question 1121907: the number of new cars purchased in a city can be modeled by the equation C=20t2 + 135t + 3050, where C is the number of new cars and t =0 corresponds to the number of new cars purchased in 198. in what year will the number of new cars purchased reach 15,000
Answer by ikleyn(52778)   (Show Source): You can put this solution on YOUR website!
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the number of new cars purchased in a city can be modeled by the equation C=20t2 + 135t + 3050,
where C is the number of new cars and t =0 corresponds to the number of new cars purchased in 198.
in what year will the number of new cars purchased reach 15,000
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Solve the quadratic equation


    20t^2 + 135t + 3050 = 15000


to get the answer.

You can use the quadratic formula for it.

If you are not familiar with the quadratic formula, learn about it from the lessons
    - Introduction into Quadratic Equations
    - PROOF of quadratic formula by completing the square
in this site.

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Also, the year 198 happened more than 1800 years ago, when no one car existed in the world, so I do not clearly understand,
what your condition is talking about.


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