An animal shelter lines up 11 cages in a row. 3 of the cages contain cats and 8 of the cages contain dogs. How many ways can the cages be arranged in a row so that all the cat cages are together and all of the dog cages are together

Ineed with number 17 i don’t get it at alll

What is always true when two whole numbers are subtracted?

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?