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