Substitute teachers with Greenwood School District get paid by the day, although subs with teaching credentials earn a different amount than subs without credentials. Yesterday, 10 non-credentialed subs (x) and 10 credentialed subs (y) taught in the district. That cost the district $1,560. Today, 3 non-credentialed subs and 10 credentialed subs taught, receiving $1,077 from the district. Choose the correct system of equation.

A.{10x+10y=15603x+10y=1077
B.{20x+13y=1560x+y=1077
C.{10x+3y=107710x+10y=1560

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

Aresearch group wants to find the opinions’ of city residents on the construction of a new downtown parking garage. what is the population of the survey downtown shoppers downtown visitors downtown workers city residents

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?