Ahot-air balloon rises vertically at a constant rate of 8 m/s. a second hot-air balloon moves past the first hot-air balloon at 3 m/s downward relative to the first hot-air balloon. what is the velocity of the second hot-air balloon relative to the ground?

Using pert, adam munson was able to determine that the expected project completion time for the construction of a pleasure yacht is 21 months, and the project variance is 4. a) what is the probability that the project will be completed in 17 months? b) what is the probability that the project will be completed in 20 months? c) what is the probability that the project will be completed in 23 months? d) what is the probability that the project will be completed in 25 months? e) what is the due date that yields a 95% chance of completion?