Please help out, TIA

Consider the following cash flow profile and assume MARR is 10% per year. ??? | Net Cash Flow $100 $25 $200 $100 $250 -$200 $100 2 4 6 a) b) c) d) What does Descartes' rule of signs tell us about the IRRs of this project? What does Norstrom's criterion tell us about the IRRs of this project? What measure of worth would you recommend using to evaluate this project? Calculate he measure of worth from (c), and make a recommendation to accept or not