The mass of the rock of gibraltar is 1.78 ⋅ 10^12 kilograms. the mass of the antarctic iceberg is 4.55 ⋅ 10^13 kilograms. approximately how many more kilograms is the mass of the antarctic iceberg than the mass of the rock of gibraltar? show your work and write your answer in scientific notation.
make sure to explain all the steps it took you to get the answer! : )

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?