As an airlines adds more first class seats, they lose economy seats that provide a smaller profit, but are more likely to be purchased.
An airline determines that the profit to be made from first class seats can be modeled by the function: P(x) = -8x^2 + 160x + 1000

As an airlines adds more first class seats they lose economy seats that provide a smaller profit but are more likely to be purchased An airline determines that class=