college algebra
posted by Carol .
suppose the revenue in dollars from selling x cell phones is R(x)= 1.2x^2+220x. the cost in dollars of selling x cell phones is C(x)=0.05x^32x^2 +65x+500. find the profit function P(x)=R(x)C(x). find the profit if x=15 hundred cell phones sold

x= 790.439875