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Math Help - i've no idea to solve this equation..please help..urgent

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    Question i've no idea to solve this equation..please help..urgent

    1.A company sells CD players finds that if it installs x CD players per day, then its costs will be C(x)=120x+4800 and its revenue will be R(x) = -2x2+400x. Find the company’s break-even points..

    2.For the first 2 years of dog’s life, dog is 10.5 dog-year per human-year and then 4 dog-year per human-year each year after that. Assuming that x represents human-years, express dog-year as a function of human year

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    Quote Originally Posted by cclia View Post
    1.A company sells CD players finds that if it installs x CD players per day, then its costs will be C(x)=120x+4800 and its revenue will be R(x) = -2x2+400x. Find the company’s break-even points.
    Review the definition of "break-even point". Then set the two equations equal to each other, and solve the resulting quadratic equation.

    Quote Originally Posted by cclia View Post
    2.For the first 2 years of dog’s life, dog is 10.5 dog-year per human-year and then 4 dog-year per human-year each year after that. Assuming that x represents human-years, express dog-year as a function of human year
    Have you studied piecewise functions at all...?
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