Help a chick out only if u know what u doing

Josephine has a great garden with and area of 2x2 + x - 6 square feet

Hey free points ! people i have a few math questions on my profile consider looking at them i have to get done in 30 mins!

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?