Find the HCF of: 5a²b² and 9x³y³​

How do i make someone brainliest? (if you answer me, i might be able to make you brainliest! )

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

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?