a. If the profit function for a firm is given by P(x) = 5400 + 210x 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.)

b. If a company has total costsC(x) = 45,000 + 25x + 0.2x²and total revenues given by R(x) = 615x 0.8x², find the break-even points. (Enter your answers as a comma-separated list.)