(a) What is an infeasible linear optimization problem? How do we find if a given linear optimization problem is infeasible? Give a real world example of a linear optimization problem where infeasibility may occur. Use at least 6 sentences to answer this question.

(b) Describe the concept and process of spreadsheet modeling and analysis. Give a real world example where spreadsheet modeling and analysis is useful. Answer in at least eight sentences.

(c) What is a marketing problem in applications of linear optimization? Briefly discuss the decision variables, the objective function, and the constraint requirements in a marketing problem. Give a real world example of a marketing problem. Answer in at least eight sentences.

(d) Explain how the simulation process is used in business analytics models. What are the advantages of using simulation? What are its limitations? How can a simulation model be verified? Give a real world example where using simulation is appropriate. Use at least 10 sentences to answer this question.