Can you pls help me and explain how you got it

If sr is 4.5cm and tr is 3cm, what is the measure in degrees of angle s?

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?

Solve the system of equations. 2x-2y=-4 and x+y=8. show work