Suppose that the revenue R, in dollars, from selling x cell phones, in hundreds, is R(x) = -1.8x^2+ 154x. The cost C, in dollars, from selling x cell phones, in hundreds, is C(x)= 0.06x^3- 3x^2+ 55x + 200. (a) Find the profit function, P(x) = R(x) - C(x).
(b) Find the profit if x = 19 hundred cell phones are sold.
(c) Interpret P(19)