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## The number of new users y​ (in millions) for a certain website between August 2008 and May 2009 can be modeled by the equation y=ax2+bx+​c, where x represents the age of the user. Using the ordered pair solutions ​(15​,1​), ​(35​,8​),and ​(55​,5​), create a system of linear equations in three variables for​ a, b, and c. Do this by substituting each ordered pair solution into the​ model, creating an equation in three variables. Solve the resulting system to find the coefficient

The number of new users y​ (in millions) for a certain website between August 2008 and May 2009 can be modeled by the equation y=ax2+bx+​c, where x represents the age of the user. Using the ordered pair solutions ​(15​,1​), ​(35​,8​),and ​(55​,5​), create a system of linear equations in three variables for​ a, b, and c. Do this by substituting each ordered pair solution into the​ model, creating an equation in three variables. Solve the resulting system to find the coefficients of the model. Then use the model to predict the number of new users for the website who were 40 years old.

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