The volume of a cylinder is 81n in. 3 and the height of the cylinder is 1 in. What is the radius of the cylinder?

Me because some of question i don’t understand

Which of the following would be a good name for the function that takes the weight of a box and returns the energy needed to lift it?

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?