In Mr. Harold's class there are 12 students. They each have 5 pencils. Some of the students, s, each lost 2 pencils. Now, the students only have a total of 38 pencils left. Which equation represents this situation?
A. s × 2 = 38
B. (12 × 5) - s = 38
C.(12 × 5) - (s × 2) = 38
D. (s × 2) - 12 = 38

Identify all the cases where non-probability sampling is used when attempting to study the characteristics of a large city. studies on every subject in the population divide a population in groups and obtain a sample studies with a limited amount of time demonstrate existing traits in a population studies with the nth person selected