Doug left $3 as a tip on a lunch bill of $14. Which proportion can be used to find the percent tip Doug left?

A) 3/14 = n/100
B) 14/3 = n/100
C) 14/n = 3/100
D) n/14 = 3/100

Can someone me and do the problem plz so i can understand it more better

How do you solving the solution of each system using elimination?

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?