The number of new cars purchased in a city can be modeled by the equation C=20t to the 2nd power, where C is the number of new c
ars and t = 0 corresponds to the number of new cars purchased in 1998. In what yr. will the number of new cars purchased reach 15,000?
1 answer:
Answer:

Step-by-step explanation:
Set up the equation:
Since C(t) gives the number of cars purchased in the t-th year after 1998, then make the number of cars equal to 15 000 and solve for t - the year:
20t^2 = 15000
t^2 = 750
t = 
The year will be simply 1998 + 5 \sqrt{30}
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