What has happened to the enrollment of students in the 20 through 21 age group over the time period?
A. Increased only
B. Decreased only
C. Increased and then decreased
D. Decreased and then increased

Samantha swam upstream for some distance in one hour. she then swam downstream the same river for the same distance in only 12 minutes. if the river flows at 4 mph, how fast can samantha swim in still water?

What is the value of y? round to the nearest tenth

Find the greatest common factor of the followig monomials 21u^5v,3u^4v^6, and 3u^2v^5