Only 40% of the students in a certain liberal arts college are males. If two students from this college are selected at random, what is the probability that they are both males?

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?

Find the maximum value of p= 4x + 5y subject to the following constraints :

Let f(x) = 5/x and g(x)=2x2+5x. what two numbers are not in the domain of f o g