I need an explanation for this Writing question to help me study.

Discussion 2: Planning and Managerial Application

After studying Chapters 5 and 6 materials including the narrated lectures, complete the following activities:

A. Using the Internet, review at least 3 articles on Profit-Cost-Volume relationship. Summary (300 words or more) the articles in your own words.

B. As a manager, why is Profit-cost-volume important in planning? Support your response with numerical example(s)

C. Using the Internet, review at least 3 articles on Variable Costing. Summary (300 words or more) the articles in your own words.

D. As a manager, discuss how you would use Variable Costing in managerial decisions Support your response with numerical example(s)

APA format and please mention references in APA format.