Question 6 The sales of television have a marginal revenue given by R'(x) = 400-0.02x , where x is the number of televisions sold. Assume that the revenue is 0 if there are no sales. (i) Find the number of televisions that need to be sold to maximize revenue. (ii) What is the maximum revenue that can be obtained from the sale of these televisions?Section 2 Essay 30 marks (15%) This section has three questions and all are compulsory. Write a brief paragraph of about 150 words to discuss the following and give references if you have cited information from articles, books, etc. Answer all questions with your example to support your answer. Each question is worth 10 marks. Question 1 Explain how to apply Cramer's Rule to solve a system of three Linear equations with three unknowns with an example and also explain when Cramer's Rule fails to give a solution? [10 marks] Question 2 Matrix Inverse Method is used to solve systems of linear equations. Explain how would you apply Matrix Inverse Method to solve a system of two linear equations with two unknowns using an example of your choice? [10 marks] Question 3 You are expected to record time spent on different things/events for any particular day during the lockdown. After the collection of data, you are expected to tabulate the data and display data using a pie chart and bar graph. [10 marks]