The perfect squares,1,4,9,16, closed under what?
a: addition
b: multiplication
c: square-rooting
d: none of these

Order the measurements from the least to the greatest. 2,720 ml , 24.91 l , 0.0268 kl

Point m is located at (-4, -6). what is located 4 units from point m? ( its on a coordinate plane by the way. )

While on a train trip, marsha noticed that there were 35 people in her train car. after the next stop, there were only 21 people in her car. if p represents the percent decrease in the number of people in marsha's train car, what is p?