Engineering Economics, need help!

1) Suppose the cash flows of an investment project in years 0 to 2 are A0--$150. Al = $150. and A2-336. Compute the ROR using the quadratic formula. 2) Suppose the cash flows of an investment project in years 0 to 3 are A0$1,000,000, Al-$500,000, A2-$400,000, and A3-X. If the ROR of the project is 8%, what is X? A0-- A2 = $400,000, 3) A new machine costs $150,000, lasts 10 years, has an annual O&M cost of $50,000, and has a salvage value of $15,000. If you want to have a 20% ROR, what should be the annual revenue from this machine