please solve them with all details

3.17 Find the equivalent annual worth for the cash flows shown, using an interest rate of 15% per year. Monetary units are $1000. 3 4 5 6 7 8 9 Year 1 2 Cash Flow, $ | 20 20 20 20 60 60 60 60 60 3.27 For the cash flows shown in the diagram, deter- mine the value of x that will make the Present worth in year 8 equal to $ -50,000 i = 10% per year 2 3 4 5 6 8 Year 2x 2x 2x