5. A company has a cost function, c(x)= x’ – 3x + 400, where x is the number of items when the cost is in dollars. The company sells their items for $55 each. a) Write a REVENUE function. [2] b) What is the cost for O items? Then explain what this means. [3] c) Write the profit function. Simplify as necessaryl [2] d) How many items must be sold and produced to maximize the profit? [2] e) What is the maximum profit? [2]