hi Pl answer these 3 topics in 4-5 pages with 3 references from peer reviewed scholarly journal in A

hi Pl answer these 3 topics in 4-5 pages with 3 references from peer reviewed scholarly journal in APA style1-Why do we say differential analysis is the key to decision making?2-Explain the difference between relevant and irrelevant costs by using examples.3-Cover the topics: adding or dropping product lines, make or buy decisions, and sell or process further decisions.