a. Describe in detail a method to solve f(x)=x-9x-48x+52 using Microsoft Excel. Include all steps of the process. 3 marks b. Explain if you can perform a regression in Excel if the form of the equation representing the relationship between the independent and dependent variables is not within the equations listed within the linear regression options in Excel. c. Consider a system of simultaneous equations. i. 1 mark Give examples of analytical and numerical methods in Excel that are available to solve the simultaneous equations. 1 mark ii. iii. Explain when the analytical technique(s) given in (i.) would be suitable. Explain the process/steps for each of the techniques given in (i.). 1 mark 2 marks d. Explain what the data validation feature within Excel does. 1 mark