PLEASEEE SOMEONE HELPPP

which values of a, b, and c represent the answer in simplest form

Can some one me with these questions

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?

Klmn and pqrs are similar trapezoids. which side of pqrs corresponds to lm