Analyze your cubic cost equation, recognizing y (vertical axis) represents the cost to manufacture and sell the number of units of your product represented on the x-axis (horizontal). Use these questions to guide your narrative analysis. What is the value of y when x equals zero? Explain. Why did we use a curve whose graph extends up and to the right rather than any other shape, including shapes with "humps"? The x-value for the relatively flat region represents the marginal cost. State the number of units to produce for marginal cost and research and explain its meaning