Suppose that the revenue R, in dollars, from selling x cell phones, in hundreds, is R(x)=-1.5x^(2)+339x. The cost C, in dollars, from selling x cell phones, in hundreds, is C(x)=0.02x^(3)-2x^(2)+70x+750 

(a) Find the profit function, P(x)=R(x)-C(x). 

(b) Find the profit if x=22 hundred cell phones ar