Please show all work and formulas!

Question 1

A 4-period investment project has the following cash flows at times t = 0, 1, 2, 3, and 4 (all cash flows in dollars): -4, 31, -28, 65, and 65, respectively. Complete the triangle for this project and then answer the following question pertaining to the bottom row of numbers; i.e., the row below the horizontal line.

Reading the numbers of the bottom row of the triangle from left to right, what is the value of the fourth number?

Question 2

A five-year project requires an investment of -137 and has the following cash flows in years 1 through 5, respectively (all cash flows in dollars): 184, -126, 214, -34, and 184. Without actually calculating any IRR, what is the maximum possible value any of the real IRRs could have? Give your answer as a percent with two decimals; e.g., 23.24