(a) Use graphical IRR analysis to find the roots of the following series of cash flows. What do you determine about this investment? Show a graph that you use to determine the rate(s) of return and the equation you use to generate the graph. (b) Use MIRR analysis to determine the rate of return, assuming 6% external borrowing rate and a 12% external investing rate and 12% MARR. Should you advise the firm to make the investment