17) The demand for a certain type of cosmetic is given by p=500 x, where p is the price in dollars where x units are demanded. a) Find the revenue R(x) that would be obtained at a price p. b) Find the price that produces the maximum revenue c) What is the maximum revenue? 18 - 19. True or false. 18) a) The average rate of change is the formula f(b) faab. True False Slim b) f(x) means x is approaching a from the left side. True False 19) a) The Marginal Profit function is the change in profit per unit change in production. True False b) A point where a graph changes concavity is called a point of inflection True False