i want to know how do i calculate these problems and how can i show my work?

• Create a MyStack class that uses an ArrayList to make a stack. Use your MyStack class to demonstrate the nested symbol algorithm seen on slide 35 of the

• If a company's profit margin is below the industry average, but its ROA equals the industry average, how is this possible?

• What are the strengths and weaknesses of Kent’s exploration of mandatory public service?