HELP PLZ! Shanice took a long bike ride today and is now 27.2 miles from home. She rides back home at an average of 9.8 miles per hour. This situation can be modeled with the equation d = 27.2 - 9.8t, where d represents the number of miles she is from home and t represents the number of hours she rides. How many hours will it take Shanice to ride home? Round your answer to the nearest hundredth.

a.) 37.0 hours

b.) 2.78 hours

c.) 17.4 hours

d.) 0.36 hours

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?