Can someone explain to me how to do these problems please and thanks

1. Which one of the following items is not an example of the agency problem between the financial manager of a corporation and its shareholders? a. Using the firm's financial resources to organize expensive parties for top executives b. Hiring family and friends without a business degree or necessary experience as financial consultants c. Not exerting due diligence to analyze available investment opportunities d. Approving investments that increase the sustainability of the firm's operations 2. You are given the following cash flows: Year 1: $10,000 Year 2: $0 Year 3: $15,000 Year 4: $20,000 Given a 5% discount rate, which formula would you use to calculate the present value of these cash flows? a. 10,000(1+.05)2+15,000(1+.05)3+20,000(1+.05)4 b. 10,000+(1+.05)315,000+(1+.05)420,000 c. 1+0.0510,000+(1+.05)215,000+(1+.05)320,000 d. 1+0.0510,000+(1+.05)315,000+(1+.05)420,000 3. Using the same cash flows and discount rate from the previous problem, which formula would you use to calculate the future value of these cash flows as of the end of year 4 ? a. 10,000(1+.05)2+15,000(1+.05)3+20,000(1+.05)4 b. 10,000(1+.05)2+15,000(1+.05)1+20,000 c. 10,000(1+.05)3+15,000(1+.05)1+20,000 d. 10,000(1+.05)3+15,000(1+.05)2+20,000(1+0.05)