need some help with these math questions, thanks!

The total costs for a company are given by C(x) = 1500 + 30x + x2 and the total revenues are given by R(x) = 110x. Find the break-even points. (Enter your answers as a comma-separated list.) units Need Help? Read It Watch It /1.42 Points] DETAILS HARMATHAP12 2.3.003. If a company has total costs C(x) = 14,000 + 45x + 0.2x- and total revenues given by R(x) = 315x - 0.8x , find the break-even points. (Enter your answers as a comma-separated list.) Need Help? Read It /1.42 Points] DETAILS HARMATHAP12 2.3.006. If the profit function for a firm is given by P(x) = -1500 + 160x - x2 and limitations on space require that production be less than 100 units, find the break-even points. (Enter your answers as a comma-separated list.) units