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Mathematics 9 Online
OpenStudy (anonymous):

The price of a certain computer stock t days after it is issued for sale is p(t)=100+20t-5t^2 dollars. The price of the stock initially rises, but eventually begins to fall. During what period of time does the stock price rise? Also after how many days would you sell it? any ideas on how to solve this one guys?

OpenStudy (anonymous):

would I set the derivative equal to 0?

OpenStudy (anonymous):

Just solved it haha I just used the quadratic equation and got +or - 2

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