What is the surface area of a right rectangular prism whose dimensions are 3 feet by 6 feet by 8 feet?

How is the number of vertices for a prism related to the name of the prism

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?

Ihonestly have no clue if it's each or none.