3.) One company estimates that it can sell C units (in hundreds) of its air conditioners if it spends x thousand dollars on advertising, given by the equation 1 x² + 11x + 15. 2 C(x) (a) (5 pts.) Use completing the square to find the vertex of this quadratic function. Show your work. = - What are the maximum number of air conditioners the company can sell and the amount of money they must spend on advertising in order to sell them? Use correct units. Money spent on ads: Max. AC units:

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